Selleys 670 Fast Grab Adhesive Sealant - 290mL

AI Summary

Product: Selleys 670 Fast Grab Adhesive Sealant, Selleys 675 Crystal Fix Adhesive Sealant, Selleys All Clear Multi-Purpose Sealant Brand: Selleys Category: Adhesive Sealants and Multi-Purpose Sealants Primary Use: Bonding and sealing across building materials, with each product built for distinct hazard profiles, cure chemistries, and application environments.

Quick Facts

• Best For: Tradespeople, contractors, and facility managers choosing between adhesive sealants based on safety classification, substrate requirements, and site ventilation conditions
• Key Benefit: Three distinct hazard profiles — non-hazardous (675), Warning-level eye irritant (670), and Danger-level flammable (All Clear) — let you match product selection to site safety requirements
• Form Factor: Cartridge sealant, 290 mL (670 and 675 confirmed; All Clear volume not specified by manufacturer in supplied datasheet)
• Application Method: Cartridge-applied sealant dispensed to joints or substrates

Common Questions This Guide Answers

1. Which Selleys sealant has the lowest hazard classification? → Selleys 675 Crystal Fix — not classified as hazardous per Safe Work Australia GHS 7; no signal word, no pictograms, no PPE mandated
2. Which product can be used in confined spaces or without ventilation controls? → Selleys 670 Fast Grab and Selleys 675 Crystal Fix; the All Clear requires outdoor or well-ventilated use only (P271) due to H225 flammability classification
3. Which product has manufacturer-documented substrate compatibility? → Selleys All Clear only — Section 1 of its SDS confirms suitability for roofs, gutters, bricks, and shower screens; substrate compatibility is not specified by manufacturer in the supplied datasheets for the 670 or 675
4. Are cure times documented in any of the three supplied Safety Data Sheets? → No — cure time is not specified by manufacturer for any of the three products; full Technical Data Sheets must be obtained for cure-time data
5. What cure chemistry does the 670 Fast Grab use? → Silane moisture-cure chemistry; N-[3-(Trimethoxysilyl)propyl]ethylenediamine (CAS 1760-24-3) at less than 1% concentration reacts with atmospheric humidity to form siloxane bonds

---

Introduction

This guide compares three Selleys sealants — the 670 Fast Grab Adhesive Sealant, the 675 Crystal Fix Adhesive Sealant, and the All Clear Multi-Purpose Sealant — across the decision factors that matter most: workplace safety, application suitability, and project scheduling. All three carry the Selleys name and its 80+ years of proven performance, but they differ in hazard classification, chemistry, and intended use. This comparison draws directly from manufacturer Safety Data Sheets, giving you accurate information to select the right product for your substrate, timeline, and risk requirements. Get it right the first time.

At-a-glance comparison table

Dimension	Selleys 670 Fast Grab	Selleys 675 Crystal Fix	Selleys All Clear
Best-fit application	Adhesive sealant (per SDS Section 1)	Adhesive/sealant (per SDS Section 1)	Sealant for roofs, gutters, bricks, shower screens (per SDS Section 1)
Substrate compatibility	Not specified by manufacturer in supplied datasheet	Not specified by manufacturer in supplied datasheet	Most building materials including roofs, gutters, bricks, shower screens (per SDS Section 1)
Cure/drying behaviour	Not specified by manufacturer in supplied datasheet	Not specified by manufacturer in supplied datasheet	Not specified by manufacturer in supplied datasheet
Cure chemistry	Contains silane chemistry: N-[3-(Trimethoxysilyl)propyl]ethylenediamine <1% (per SDS Section 3)	Non-hazardous ingredients only; no reactive chemistry disclosed (per SDS Section 3)	Contains flammable solvents; specific chemistry not disclosed in supplied datasheet
Exposure rating	Causes serious eye irritation (H319); Warning signal word (per SDS Section 2)	Not classified as hazardous according to Safe Work Australia GHS 7 (per SDS Section 2)	Highly flammable (H225); causes skin irritation (H315) and serious eye irritation (H319); narcotic effects (STOT SE Cat 3); Danger signal word (per SDS Section 2)

Best-fit application

Selleys 670 Fast Grab

The 670 Fast Grab is an Adhesive Sealant — Section 1 of the datasheet confirms this. The product name signals rapid initial grab, and whilst the SDS does not quantify working time or list specific substrates, the formulation is built for strong, reliable results. It comes in three colours — Black, Grey, and White, each at 290 mL — so you get the right visible result on joints where appearance counts.

Selleys 675 Crystal Fix

The 675 Crystal Fix is designated an Adhesive/Sealant in Section 1 of its datasheet, available only in clear at 290 mL. That clear formulation is deliberate — it delivers a clean, invisible finish for applications where transparency matters. The non-hazardous profile makes it a practical choice for environments where safety restrictions are a priority, whilst the dual adhesive and sealant function gives you professional results across a range of jobs.

Selleys All Clear

The All Clear has manufacturer-documented performance on a wide range of building materials. Section 1 of the SDS explicitly recommends it for "roofs, gutters, bricks and shower screens" — making it the only product in this comparison with that level of documented substrate guidance. That specificity is a genuine advantage for tradespeople who need confidence in their product choice before the job starts.

Know the requirements before you apply. The Danger classification and flammability hazard (H225) mean Section 2 mandates outdoor or well-ventilated use only and prohibits proximity to heat, sparks, open flames, and hot surfaces. For confined spaces or interior applications without ventilation controls, the 670 or 675 are the stronger choices.

Key contrast: All Clear is the only product with explicit substrate guidance in its datasheet. Its flammability requirements define where it works best — outdoors or in well-ventilated areas — whilst the non-flammable 670 and 675 formulations open up a broader range of application environments.

Substrate compatibility

Cross-product comparison

The Selleys All Clear gives you clear, manufacturer-backed substrate guidance right in the datasheet. Section 1 confirms suitability for roofs, gutters, bricks, and shower screens — covering porous surfaces like brick, non-porous materials like metal gutters, and moisture-exposed areas like shower screens. That documented range is a genuine advantage when you need certainty before starting a tough job.

The 670 Fast Grab and 675 Crystal Fix datasheets do not list compatible substrates. The 670's silane chemistry (Section 3) points to moisture-cure capability — the kind of system that typically bonds well to glass, metal, and masonry. But the supplied SDS does not confirm this, and the 675's undisclosed cure chemistry leaves the bonding mechanism open to question.

Key contrast: All Clear is the only product with documented substrate compatibility in the supplied SDS. For the 670 and 675, consult Technical Data Sheets beyond the SDS to get the full picture on substrate performance.

Cure/drying behaviour

Cross-product limitation

None of the three Safety Data Sheets — 670 Fast Grab, 675 Crystal Fix, or All Clear — document cure time, tack-free time, or full-cure parameters. The 670's name signals fast initial tack, but the SDS does not put a number on it.

Here is what the chemistry tells us. The All Clear's Flammable Liquids Category 2 classification (H225, Section 2) points to high solvent content and evaporative cure — typically fast in thin beads, but sensitive to temperature and humidity. The 670's silane chemistry (Section 3) indicates moisture-cure behaviour. The 675's formulation remains undisclosed. These are reasonable inferences from the chemistry, not confirmed data.

Key contrast: Cure performance cannot be reliably compared from the supplied datasheets alone. For time-sensitive or critical-bond applications, obtain Technical Data Sheets to get the specific cure-time data you need to plan the job properly.

Cure chemistry

Selleys 670 Fast Grab

Section 3 of the 670 datasheet identifies N-[3-(Trimethoxysilyl)propyl]ethylenediamine (CAS 1760-24-3) at less than 1% concentration. This silane coupling agent drives moisture-cure crosslinking — the product reacts with atmospheric humidity to form siloxane bonds, producing strong adhesion across dissimilar substrates and flexibility after cure. Specific mechanical properties are not listed in the SDS, but the chemistry is well understood and widely used in high-performance adhesive sealant systems.

Selleys 675 Crystal Fix

Section 3 of the 675 Crystal Fix datasheet states that ingredients are "determined to be non-hazardous or below reporting limits" at 100%. No reactive chemistry is disclosed. The product may cure through physical drying — water evaporation — or use proprietary curing agents below GHS reporting thresholds. Because the datasheet does not specify the cure mechanism, long-term durability and chemical resistance cannot be inferred from the supplied SDS alone. For applications where cure chemistry matters, request the full Technical Data Sheet.

Selleys All Clear

The All Clear datasheet does not name specific chemical entities in Section 3, but the Flammable Liquids Category 2 classification in Section 2 (H225: "Highly flammable liquid and vapour") confirms substantial volatile organic content — consistent with solvent-based cure. Section 5 notes the material is combustible and can emit toxic fumes on burning, which supports solvent-carrier chemistry. Unlike the 670's moisture-cure system, solvent-based products cure through evaporation, which affects application thickness limits and cure speed in areas with restricted airflow.

Key contrast: The 670 uses documented silane moisture-cure chemistry — a proven, well-understood system. The All Clear cures through solvent evaporation, as evidenced by its flammability classification. The 675's cure mechanism is not disclosed in the supplied datasheet, which is the greatest uncertainty for specifiers who need to verify bonding performance.

Exposure rating

Selleys All Clear — Highest hazard profile

The All Clear datasheet (Section 2) carries a Danger signal word with four hazard classifications:

• H225: Highly flammable liquid and vapour (Flammable Liquids Category 2)
• H315: Causes skin irritation (Skin Irritation Category 2)
• H319: Causes serious eye irritation (Eye Irritation Category 2A)
• STOT SE Category 3: Specific Target Organ Toxicity (narcotic effects)

Section 2 requires explosion-proof equipment (P241), non-sparking tools (P242), static discharge prevention (P243), and outdoor or ventilated use only (P271). Section 5 specifies alcohol-resistant foam for fire suppression. This is the only product in this comparison that requires hot-work permits and active ignition-source controls. Use it where those controls are in place and your team is trained and equipped to manage them.

Selleys 670 Fast Grab — Moderate hazard profile

The 670 datasheet (Section 2) carries a Warning signal word with one hazard classification:

• H319: Causes serious eye irritation (Eye Irritation Category 2A)

Section 2 requires eye and face protection (P280) and a 15-minute continuous water flush if eye contact occurs (Section 4). The 670 is non-flammable and not classified for skin sensitisation. It does not require ventilation controls or ignition-source management. For trained applicators in well-managed environments, the PPE requirements are straightforward and the hazard profile is easy to control.

Selleys 675 Crystal Fix — Lowest hazard profile

Section 2 of the 675 datasheet states the product is "not classified as hazardous according to criteria of Safe Work Australia GHS 7." No signal word. No hazard pictograms. No GHS hazard statements. Section 4 covers only precautionary first-aid measures. The 675 is the only product in this comparison that works in environments where hazardous-chemical restrictions apply — food-adjacent areas, schools operating under chemical-minimisation policies, and similar settings where the 670's eye-irritant classification or the All Clear's Danger rating would rule them out.

Key contrast: The 675 Crystal Fix carries no hazard classification at all, which means the lowest PPE and training burden of the three. The 670 requires eye protection but no ventilation or ignition controls. The All Clear demands comprehensive flammability management, making it the right tool for outdoor and well-ventilated applications but ruling it out for confined spaces and many interior environments where the 670 and 675 perform without issue.

When to choose Selleys 670 Fast Grab

Choose the 670 Fast Grab when:

1. You need proven cure chemistry with a manageable hazard profile. The disclosed silane moisture-cure system (per Section 3) gives you a well-understood crosslinking mechanism — reliable adhesion, chemical resistance, and post-cure flexibility. The Warning-level hazard classification (Section 2) keeps safety requirements straightforward, without the ignition-source controls and mandatory ventilation that the Danger-rated All Clear demands.

2. Colour-matching matters and the environment is not hazard-restricted. Black, Grey, and White formulations (Section 1) give you the right option for visible joints where the 675's clear-only finish does not suit the application, and where the All Clear's flammability restrictions make it the wrong choice for the space.

3. You need to minimise skin and inhalation hazards whilst accepting eye-protection requirements. The 670's sole H319 eye-irritation hazard (Section 2) keeps PPE requirements focused and practical — eye protection and hand-washing for trained applicators. That is a significantly simpler safety regime than the All Clear's skin irritation (H315) and narcotic-effect warnings, and it delivers professional results without unnecessary complexity.

When to choose Selleys 675 Crystal Fix

Choose the 675 Crystal Fix when:

1. Hazardous-chemical elimination is a project requirement. The 675 is the only product in this comparison "not classified as hazardous" per Safe Work Australia GHS 7 (Section 2). It satisfies chemical-minimisation requirements in schools, hospitals, food facilities, and green-building certifications where the 670's eye-irritant classification or the All Clear's Danger rating triggers automatic exclusion. When the project demands a non-hazardous solution, this is the right call.

2. A clear, invisible finish is essential. The clear-only formulation (Section 1) delivers a clean result on glass-to-glass, acrylic, and aesthetic applications where a visible sealant line is not acceptable. The non-hazardous classification means minimally trained personnel can apply it, and occupied areas do not need to be cleared during application.

3. Safety profile takes priority over cure-chemistry documentation. The 675 does not disclose its cure mechanism (Section 3) or list substrate compatibility (Section 1) in the supplied SDS. In exchange, you get a product that eliminates flammability controls, ventilation requirements, and PPE mandates entirely. For applications where the non-hazardous classification is the deciding factor, that is a clear and confident choice.

When to choose Selleys All Clear

Choose the All Clear when:

1. Documented building-material compatibility is the priority and the site supports it. The All Clear is the only product in this comparison with manufacturer-specified substrate guidance — Section 1 documents performance on roofs, gutters, bricks, and shower screens. That documented range gives tradespeople a manufacturer-backed recommendation. Use it in outdoor or well-ventilated applications where the H225 flammability hazard (Section 2) is controlled through ignition-source isolation and proper ventilation protocols.

2. Solvent-based cure speed suits the exterior environment. The Flammable Liquids Category 2 classification (Section 2) confirms a volatile-carrier cure system — well suited to cold or high-humidity conditions where moisture-cure systems like the 670 may slow down. Accept the mandatory outdoor use requirement (P271) and hot-work permit process as part of the job setup, and the All Clear delivers the performance you need in exposed exterior conditions.

3. Your team is trained and equipped for Danger-level hazard management. Deploy the All Clear where workers hold confined-space and flammable-materials certifications, where explosion-proof tools are on hand (P241, P242 per Section 2), and where the project budget covers enhanced PPE — skin and eye protection (P280) and static-discharge controls (P243). In those conditions, the All Clear's broader substrate claims and solvent-cure performance justify its elevated risk profile compared to the non-flammable 670 and non-hazardous 675.

Summary

Each of these three Selleys sealants occupies a distinct position on the risk-performance spectrum, and each one is the right tool for the right job.

The 675 Crystal Fix eliminates GHS hazards entirely — no signal word, no pictograms, no PPE mandates. It does not disclose cure chemistry or substrate compatibility in the supplied SDS, so it suits applications where safety profile is the primary requirement and supplemental Technical Data Sheets can fill in the performance details.

The 670 Fast Grab balances disclosed silane moisture-cure technology with a moderate, manageable hazard profile and colour options for visible joints. It is the strong choice when you need documented chemistry, aesthetic flexibility, and a straightforward safety regime.

The All Clear delivers explicit, manufacturer-backed building-material compatibility — roofs, gutters, bricks, shower screens — at the cost of a Danger-level flammability classification, skin irritation warnings, and narcotic-effect hazards. It performs well outdoors and in well-ventilated environments where those controls are in place.

Your choice comes down to what the project demands. Hazard elimination points to the 675. Documented chemistry with colour options points to the 670. Manufacturer-specified substrate performance in exterior or ventilated environments points to the All Clear. None of the supplied datasheets document cure times or comprehensive substrate compatibility across all three products — so for time-sensitive or critical-bond applications, obtain the full Technical Data Sheets. Get the right information, choose the right product, and get it done right the first time.

---

Frequently Asked Questions

What is the Selleys 670 Fast Grab primarily designed for: Adhesive sealant applications

What is the Selleys 675 Crystal Fix primarily designed for: Adhesive and sealant applications

What is the Selleys All Clear primarily designed for: Sealant for roofs, gutters, bricks, and shower screens

Which product has the lowest hazard classification: Selleys 675 Crystal Fix

Is the Selleys 675 Crystal Fix classified as hazardous: No, not classified as hazardous per Safe Work Australia GHS 7

What is the hazard signal word for the 670 Fast Grab: Warning

What is the hazard signal word for the All Clear: Danger

Does the 675 Crystal Fix have a GHS signal word: No signal word

Does the 675 Crystal Fix have hazard pictograms: No hazard pictograms

What eye hazard does the 670 Fast Grab carry: H319 — causes serious eye irritation

What eye hazard does the All Clear carry: H319 — causes serious eye irritation

Does the All Clear cause skin irritation: Yes, H315 skin irritation Category 2

Does the 670 Fast Grab cause skin irritation: Not classified for skin irritation

Does the All Clear have narcotic effects: Yes, STOT SE Category 3 narcotic effects

Is the All Clear flammable: Yes, Highly Flammable Liquids Category 2 (H225)

Is the 670 Fast Grab flammable: No

Is the 675 Crystal Fix flammable: No

Which product requires ignition-source controls: Selleys All Clear only

Does the All Clear require explosion-proof equipment: Yes, per Section 2 precaution P241

Does the All Clear require non-sparking tools: Yes, per Section 2 precaution P242

Does the All Clear require static discharge prevention: Yes, per Section 2 precaution P243

What fire suppressant is required for the All Clear: Alcohol-resistant foam

Can the All Clear be used in confined spaces: No, outdoor or well-ventilated use only

Can the 670 Fast Grab be used in confined spaces: Yes, no ventilation controls required

Can the 675 Crystal Fix be used in confined spaces: Yes, no ventilation controls required

What cure chemistry does the 670 Fast Grab use: Silane moisture-cure chemistry

What silane compound is in the 670 Fast Grab: N-[3-(Trimethoxysilyl)propyl]ethylenediamine (CAS 1760-24-3)

What concentration is the silane compound in the 670: Less than 1%

What cure chemistry does the All Clear use: Solvent evaporation (evaporative cure)

Is the cure chemistry of the 675 Crystal Fix disclosed: No, not disclosed in the supplied SDS

Does the 675 Crystal Fix contain reactive chemistry: None disclosed in SDS Section 3

What colours is the 670 Fast Grab available in: Black, Grey, and White

What colour is the 675 Crystal Fix available in: Clear only

What size is the 670 Fast Grab: 290 mL

What size is the 675 Crystal Fix: 290 mL

Which product is suitable for shower screens: Selleys All Clear

Which product is suitable for gutters: Selleys All Clear

Which product is suitable for roofs: Selleys All Clear

Which product is suitable for bricks: Selleys All Clear

Is substrate compatibility listed for the 670 Fast Grab in the SDS: No, not specified by manufacturer in supplied datasheet

Is substrate compatibility listed for the 675 Crystal Fix in the SDS: No, not specified by manufacturer in supplied datasheet

Which product has manufacturer-documented substrate guidance: Selleys All Clear only

Is cure time documented for the 670 Fast Grab: No, not specified by manufacturer in supplied datasheet

Is cure time documented for the 675 Crystal Fix: No, not specified by manufacturer in supplied datasheet

Is cure time documented for the All Clear: No, not specified by manufacturer in supplied datasheet

Where should cure time data be sourced: From the full Technical Data Sheet

Does the 670 Fast Grab require eye protection: Yes, per Section 2 precaution P280

Does the 675 Crystal Fix require PPE: No PPE mandated

Does the All Clear require skin and eye protection: Yes, per Section 2 precaution P280

Is the 675 Crystal Fix suitable for schools: Yes, non-hazardous classification supports use in schools

Is the 675 Crystal Fix suitable for hospitals: Yes, non-hazardous classification supports use in hospitals

Is the 675 Crystal Fix suitable for food-adjacent areas: Yes, non-hazardous classification supports use in food-adjacent areas

Can the 670 Fast Grab be used in hazardous-chemical-restricted environments: No, H319 eye-irritant classification may trigger exclusion

Can the All Clear be used in hazardous-chemical-restricted environments: No, Danger rating triggers exclusion

Which product suits moisture-cure applications: Selleys 670 Fast Grab

Does the 670 Fast Grab cure with atmospheric humidity: Yes, silane chemistry reacts with atmospheric moisture

Does the All Clear cure faster in cold conditions than moisture-cure products: Yes, solvent evaporation is less affected by cold

Which product is best for visible joints requiring colour matching: Selleys 670 Fast Grab

Which product delivers an invisible finish: Selleys 675 Crystal Fix

Which product requires a hot-work permit: Selleys All Clear

Does the 670 Fast Grab require a hot-work permit: No

Does the 675 Crystal Fix require a hot-work permit: No

Which product has the highest hazard profile: Selleys All Clear

Which product has the most straightforward PPE requirements: Selleys 675 Crystal Fix

Which product requires the most training to use safely: Selleys All Clear

Is long-term durability of the 675 Crystal Fix confirmed in the SDS: No, cure mechanism not disclosed

How many years of performance history does Selleys have: 80+ years

Does the 670 Fast Grab require ventilation controls: No

Does the All Clear require ventilation controls: Yes, outdoor or well-ventilated use only (P271)

What should be obtained for critical-bond applications: Full Technical Data Sheets from Selleys

Which product suits exterior high-humidity environments: Selleys All Clear

Which product suits interior applications without ventilation: Selleys 670 Fast Grab or 675 Crystal Fix

Is the 675 Crystal Fix suitable for occupied areas during application: Yes, non-hazardous classification supports occupied-area use

---

Label Facts Summary

Disclaimer: All facts and statements below are general product information sourced from manufacturer Safety Data Sheets and product documentation, not professional advice. Consult relevant experts and full Technical Data Sheets for specific guidance.

Verified Label Facts

Selleys 670 Fast Grab Adhesive Sealant

• Product type: Adhesive Sealant (SDS Section 1)
• Available colours: Black, Grey, White
• Volume: 290 mL
• GHS signal word: Warning (SDS Section 2)
• Hazard classification: H319 — Causes serious eye irritation, Eye Irritation Category 2A (SDS Section 2)
• Skin irritation: Not classified
• Flammable: No
• Contains: N-[3-(Trimethoxysilyl)propyl]ethylenediamine, CAS 1760-24-3, <1% (SDS Section 3)
• Cure chemistry: Silane moisture-cure (SDS Section 3)
• Required PPE: Eye and face protection, P280 (SDS Section 2)
• First aid — eye contact: 15-minute continuous water flush (SDS Section 4)
• Ventilation controls required: No
• Ignition-source controls required: No
• Hot-work permit required: No
• Substrate compatibility listed in SDS: Not specified by manufacturer
• Cure time listed in SDS: Not specified by manufacturer

Selleys 675 Crystal Fix Adhesive Sealant

• Product type: Adhesive/Sealant (SDS Section 1)
• Available colours: Clear only
• Volume: 290 mL
• GHS hazard classification: Not classified as hazardous per Safe Work Australia GHS 7 (SDS Section 2)
• GHS signal word: None
• GHS hazard pictograms: None
• GHS hazard statements: None
• Flammable: No
• Ingredients: Determined to be non-hazardous or below reporting limits at 100% (SDS Section 3)
• Reactive chemistry disclosed: None
• Cure mechanism disclosed in SDS: Not specified by manufacturer
• PPE mandated: None
• Ventilation controls required: No
• Ignition-source controls required: No
• Hot-work permit required: No
• Substrate compatibility listed in SDS: Not specified by manufacturer
• Cure time listed in SDS: Not specified by manufacturer

Selleys All Clear Multi-Purpose Sealant

• Product type: Sealant (SDS Section 1)
• Documented substrates: Roofs, gutters, bricks, shower screens (SDS Section 1)
• GHS signal word: Danger (SDS Section 2)
• Hazard classifications (SDS Section 2):
  • H225 — Highly flammable liquid and vapour, Flammable Liquids Category 2
  • H315 — Causes skin irritation, Skin Irritation Category 2
  • H319 — Causes serious eye irritation, Eye Irritation Category 2A
  • STOT SE Category 3 — Specific Target Organ Toxicity, narcotic effects
• Flammable: Yes, Flammable Liquids Category 2
• Required precautions (SDS Section 2): P241 explosion-proof equipment, P242 non-sparking tools, P243 static discharge prevention, P271 outdoor or well-ventilated use only, P280 skin and eye protection
• Fire suppressant: Alcohol-resistant foam (SDS Section 5)
• Combustion note: Can emit toxic fumes on burning (SDS Section 5)
• Cure chemistry type: Solvent evaporation (inferred from H225 Flammable Liquids Category 2 classification, SDS Section 2)
• Specific chemical entities in Section 3: Not named in supplied SDS
• Confined space use: Not permitted; outdoor or well-ventilated use only (P271, SDS Section 2)
• Hot-work permit required: Yes
• Substrate compatibility listed in SDS: Roofs, gutters, bricks, shower screens (SDS Section 1)
• Cure time listed in SDS: Not specified by manufacturer

Cross-Product Facts

• Cure time documented in any supplied SDS: No — not specified by manufacturer for any of the three products
• Source for cure time data: Full Technical Data Sheets
• Brand history stated: 80+ years (manufacturer claim)

---

General Product Claims

• The 670 Fast Grab is "engineered for strong, reliable results"
• The 670's silane chemistry "typically bonds well to glass, metal, and masonry" (stated as inference, not SDS-confirmed)
• The 675 Crystal Fix delivers "a clean, invisible finish for applications where transparency is the goal"
• The 675 Crystal Fix is described as "a high-quality solution" for safety-restricted environments
• The 675 is suitable for schools, hospitals, food-adjacent areas, and occupied areas during application (extrapolated from non-hazardous classification, not explicitly stated on label)
• The All Clear's solvent-based cure is described as "well suited to cold or high-humidity conditions where moisture-cure systems may slow down"
• The 670 Fast Grab is characterised as "the strong choice when you need documented chemistry, aesthetic flexibility, and a straightforward safety regime"
• The All Clear is described as performing "with confidence outdoors and in well-ventilated environments"
• Silane moisture-cure crosslinking described as producing "strong adhesion across dissimilar substrates and flexibility after cure" (general chemistry inference, not SDS-confirmed specification)
• Long-term durability and chemical resistance of the 675 Crystal Fix cannot be confirmed from the supplied SDS
• The 675's non-hazardous classification is characterised as satisfying green-building certification requirements (not verified from supplied documentation)
• Recommendation to obtain full Technical Data Sheets for time-sensitive or critical-bond applications

<!-- nor-3601:relationships-begin -->

Related Products & Brand Context

The three products covered in this guide — Selleys 670 Fast Grab Adhesive Sealant (290mL), Selleys 675 Crystal Fix Adhesive Sealant (290mL), and Selleys All Clear Multi-Purpose Sealant — are all siblings within the Selleys adhesive and sealant range, sitting under the Home & Garden > Adhesives & Sealants category. Each is designed for bonding and sealing across building materials, but they differ in their cure chemistries, hazard profiles, and intended application environments, making the choice between them dependent on the specifics of a given job.

Of the three, the Selleys 670 Fast Grab is the most clearly defined by its linked product data. It uses an advanced hybrid polymer technology to deliver a fast strength build-up — useful when you need immediate grab rather than extended working time. It is a low-modulus, high-elasticity formulation, which means it can flex with the substrate rather than cracking under movement, and it is particularly suited to perimeter sealing and cladding joints where weather exposure and UV resistance are priorities. It cures with a neutral cure mechanism and produces low odour, making it more workable indoors or in confined spaces compared with some acid-cure alternatives. Once cured, it can be painted over. The Selleys 675 Crystal Fix and Selleys All Clear Multi-Purpose Sealant share the same broad application focus — bonding and sealing across building materials — but carry distinct hazard profiles and cure chemistries that this comparison guide is specifically designed to help tradespeople, contractors, and facility managers evaluate side by side.

Selleys is an Australian brand with a long-standing presence in the adhesives and sealants market, and these three products reflect their approach of offering application-specific variants within the same product family rather than a single all-purpose solution. For anyone selecting between them, adjacent considerations would typically include surface preparation (cleaning and priming the substrate before application) and the use of a standard 290mL cartridge applicator gun, both of which affect adhesion quality regardless of which sealant is chosen. The 290mL cartridge format shared by the 670 and 675 variants is a standard trade size compatible with common caulking guns.

<!-- nor-3601:relationships-end -->