Product Facts

Product Name
Selleys No More Big Gaps - Expanding Foam Filler 390ml
Availability
In Stock
Condition
New
Category
Home & Garden > Building Materials & Hardware > Gap Fillers
Seller
Selleys
Material
Expanding polyurethane foam
Selleys No More Big Gaps - Expanding Foam Filler 390ml

Selleys No More Big Gaps - Expanding Foam Filler 390ml

PRODUCT STATUS: DISCONTINUED — December 2023. This product is no longer manufactured and may not be available for purchase. Verify current availability with a retailer before specifying or ordering. Selleys No More Big Gaps - Expanding Foam Filler 390ml. Expanding polyurethane foam technology. COMPOSITION - Technology: Expanding polyurethane foam PERFORMANCE - Paintability: Yes, once cured CURING - Cure Time: 4–5 hrs (3–5 cm gaps) LIMITATIONS / NOT SUITABLE FOR Not suitable for underwater or continuously damp conditions. Not load-bearing or structural. Prolonged UV exposure may cause surface discolouration — paint if required. DIRECTIONS FOR USE 1. Clean and dampen surfaces for best adhesion. 2. Shake can well and attach nozzle. 3. Hold can upside down and apply foam into gap (fill to ~1/3, it will expand). 4. Allow to cure (4–5 hrs for 3–5 cm gaps). 5. Once cured, trim, sand, and paint if desired. IMPORTANT INFORMATION Foam expands significantly (2.5–3×) — avoid overfilling. Shake can well before use. Protect surrounding surfaces from overspray. ADDITIONAL SPECIFICATIONS - Finish: Semi-rigid closed cell - Expansion: 2.5–3× original volume - Tack-Free Time: ~15 mins

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Safety Data Sheet - AU
Technical Data Sheet - AU
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AI Summary

Product: Selleys Gap-Filling Products Comparison (No More Big Gaps Expanding Foam 390ml, No More Gaps Bricks & Mortar 440g, No More Gaps Coloured Gaps/Exterior 450g) Brand: Selleys Category: Gap-filling and sealing products (expanding foam and acrylic sealants) Primary use: Filling and sealing gaps in building substrates using either expanding polyurethane foam for large structural voids or acrylic sealants for finish-visible joints in masonry and exterior weatherproofing.

Quick facts

Common questions this guide answers

  1. Which product should I use for gaps larger than 25mm? → No More Big Gaps Expanding Foam, which expands two to three times its dispensed volume to fill large irregular voids
  2. Which product is safest for indoor use with limited ventilation? → Either acrylic sealant (Bricks & Mortar or Coloured Gaps/Exterior), both carrying only a skin sensitisation warning (H317) versus the foam's Danger-level hazards including suspected carcinogen (H351) and respiratory sensitiser (H334)
  3. Which product provides a colour-matched finish for visible masonry joints without painting? → No More Gaps Bricks & Mortar, available in five masonry-matched colours: Charcoal, Medium Grey, Off White, Sandstone, and Terracotta

Product guide: Selleys gap-filling products comparison

Introduction

This guide compares three Selleys gap-filling products across two technologies: an expanding polyurethane foam (No More Big Gaps) and two acrylic gap sealants (Bricks & Mortar and Coloured Gaps/Exterior). All three tackle gaps in building substrates, but they work differently — different chemistry, different hazard profiles, different applications, different colour options. Use this comparison to choose between a high-expansion foam built for volumetric void-filling and coloured sealants engineered for finish-visible joints in masonry and exterior weatherproofing.

At-a-glance comparison table

Dimension No More Big Gaps Expanding Foam 390ml No More Gaps Bricks & Mortar 440g No More Gaps Coloured Gaps 450g
Product type Expanding foam filler (aerosol) Gap sealant Gap sealant
Hazard classification Danger: Extremely flammable aerosol (H222), suspected carcinogen (H351), respiratory sensitiser (H334), causes organ damage (H372) Warning: May cause allergic skin reaction (H317) only Warning: May cause allergic skin reaction (H317) only
Colour options Not specified by manufacturer (typically tan/beige foam) 5 colours: Charcoal, Medium Grey, Off White, Sandstone, Terracotta Not specified by manufacturer in supplied datasheet
Pack size 390ml (aerosol canister) 440g (cartridge) 450g nominal (430g listed in datasheet)
Recommended use per datasheet Expanding foam filler Gap sealant Gap sealant
Dangerous Goods classification Pending manufacturer confirmation (aerosol classifications typically apply) Not classified as Dangerous Goods Not classified as Dangerous Goods
Key active ingredients Polyurethane chemistry (specific formulation not detailed in excerpt) Acrylic base with UV stabilisers (Bis-pentamethyl-piperidyl sebacate) and biocides (BIT, CMIT, MIT, OIT) Acrylic base with biocides (BIT, MIT, OIT); no UV stabiliser listed

Best-fit application

No More Big Gaps Expanding Foam

The Big Gaps datasheet confirms this as an "expanding foam filler" delivered via aerosol. The name says it all — this product is built for larger voids where volumetric expansion gets the job done. As a polyurethane foam, it cures by reacting with atmospheric moisture and expands to fill irregular cavities completely. The right applications include sealing around window and door frames, filling large cracks in walls, and insulating penetrations where traditional sealants simply don't have the volume to bridge the gap.

No More Gaps Bricks & Mortar

The Bricks & Mortar datasheet confirms this as a "gap sealant" with five masonry-matched colours: Charcoal, Medium Grey, Off White, Sandstone, and Terracotta. The product name and colour palette make the design intent clear — filling and sealing gaps in brickwork, mortar joints, and masonry substrates where a colour-matched finish delivers the professional visible result tradespeople and homeowners want.

No More Gaps Coloured Gaps (Exterior)

The Exterior datasheet (note: the supplied PDF is labelled "EXTERIOR" while the comparison request names it "Coloured Gaps") designates this as a "gap sealant." The "Exterior" designation in the datasheet title points to a formulation for outdoor weatherproofing applications, though specific substrate recommendations are not detailed in the safety data provided.

Key contrast: The expanding foam is a volumetric void-filler for structural gaps. The two sealants are surface-applied products for finish joints — Bricks & Mortar is purpose-built for masonry aesthetics, while Exterior/Coloured Gaps is positioned for general outdoor use.

Substrate compatibility

The supplied safety datasheets do not contain substrate compatibility charts. The product naming provides clear directional guidance:

For substrate-specific performance data, consult the separate technical data sheets (TDS) from Selleys — that's where you'll find application-critical details that safety documents don't cover.

Cure and drying behaviour

The safety datasheets provided do not specify cure times, tack-free times, or full-cure performance windows for any of the three products. Polyurethane foams (Big Gaps) and acrylic gap sealants (Bricks & Mortar, Exterior) cure by different mechanisms — foam by moisture-activated chemical reaction, sealants by evaporative drying — but the datasheets don't quantify these timelines.

One formulation difference worth noting: the Bricks & Mortar datasheet lists Bis(1,2,2,6,6-pentamethyl-4-piperidyl) sebacate, a UV stabiliser, at less than 1% concentration. This additive protects the cured sealant from UV degradation — long-term durability built into the formula. The Exterior datasheet does not list this UV stabiliser in its composition table, despite the product name suggesting outdoor use. This discrepancy may reflect different formulations or incomplete compositional disclosure in the safety data, and it's worth clarifying before specifying this product for long-term outdoor exposure.

Gap size and depth capability

No More Big Gaps Expanding Foam

The product name tells the story — built for big gaps. Expanding polyurethane foams in this category handle gaps ranging from approximately 20mm to 100mm and beyond, expanding two to three times their dispensed volume to fill irregular voids. The datasheet does not specify maximum gap dimensions or expansion ratios.

No More Gaps Bricks & Mortar and Coloured Gaps/Exterior

Both products are classified as "gap sealants" rather than expanding foams. High-quality acrylic gap sealants are formulated for narrower joints — typically 3–25mm — with minimal shrinkage during cure. Neither datasheet provides maximum gap width or depth specifications.

For gaps exceeding approximately 25mm, the expanding foam is the right call among these three products. Non-expanding sealants used in deep, wide voids risk excessive shrinkage and poor adhesion.

Paintability

None of the three safety datasheets address paintability, topcoat compatibility, or overcoating instructions. This information lives in the technical data sheets rather than safety documentation.

Colour options give a practical guide to paint requirements:

Hazard and handling profile

No More Big Gaps Expanding Foam

The Big Gaps datasheet classifies this as a Danger-level product with the following hazard warnings:

The datasheet requires protective equipment, use in well-ventilated areas only, and special precautions during pregnancy and nursing. This product demands significantly more stringent handling controls than the two sealants.

No More Gaps Bricks & Mortar

The Bricks & Mortar datasheet classifies this as a Warning-level product with a single hazard: H317, may cause an allergic skin reaction. Wear protective gloves and avoid skin contact. Not classified as a Dangerous Good for transport.

No More Gaps Coloured Gaps/Exterior

The Exterior datasheet lists the same hazards as Bricks & Mortar: H317, may cause an allergic skin reaction. Warning signal word. Not classified as a Dangerous Good.

The expanding foam's carcinogenicity warning (H351), respiratory sensitisation risk (H334), and organ toxicity (H372) make it the wrong choice for poorly ventilated spaces or use by anyone with respiratory conditions. The two sealants carry only a skin sensitisation risk, making them the safer option for indoor application where ventilation is limited.

When to choose No More Big Gaps Expanding Foam 390ml

  1. Large structural voids greater than 25mm where expansion is the only way to fill irregular cavities completely — gaps around rough window openings, pipe penetrations through walls, or voids behind cladding.
  2. Insulation and draft-proofing applications where the foam's closed-cell structure delivers thermal resistance alongside gap-filling performance.
  3. Concealed locations where the product will be trimmed and painted or hidden from view, and where excellent ventilation can be maintained throughout application — non-negotiable given the product's hazard profile.

When to choose No More Gaps Bricks & Mortar 440g

  1. Visible masonry joints requiring a colour-matched finish — filling cracks in brick walls, repointing mortar joints, or sealing expansion joints where one of the five earth-tone colours (Charcoal, Medium Grey, Off White, Sandstone, Terracotta) matches existing brickwork.
  2. Small to medium gaps, typically 3–25mm, in masonry substrates where a non-expanding, pre-coloured sealant gives a professional finish without painting.
  3. Indoor and outdoor environments where the absence of flammability, carcinogenicity, and respiratory hazards — compared to the foam — is a controlling safety requirement.

When to choose No More Gaps Coloured Gaps/Exterior 450g

  1. Exterior weatherproofing applications (per the "Exterior" designation in the datasheet) where a reliable gap sealant is needed for outdoor joints. Note that the absence of the UV stabiliser found in Bricks & Mortar raises questions about long-term UV resistance — verify this before specifying for extended outdoor exposure.
  2. General gap-sealing tasks where the lower hazard profile (skin sensitisation only) is a clear advantage and where the specific masonry colour-matching of Bricks & Mortar is not required.
  3. Small to medium gaps in non-masonry substrates, though substrate compatibility is not specified in the provided documentation.

Note: The conflicting product naming ("Coloured Gaps" vs. "Exterior" datasheet title) and pack size discrepancy (450g stated vs. 430g in datasheet) mean you should verify you're reviewing the correct product variant before purchase.

Summary

The core decision is foam vs. sealant. No More Big Gaps Expanding Foam is the right tool for large voids greater than 25mm that need volumetric expansion to fill completely — but it carries significant health hazards (suspected carcinogen, respiratory sensitiser, organ toxicity) that demand stringent ventilation and full PPE.

The two gap sealants — Bricks & Mortar and Coloured Gaps/Exterior — share near-identical hazard profiles (skin sensitisation only) and are both acrylic-based products for narrower joints. Bricks & Mortar stands out with five masonry-matched colours and documented UV stabilisation for outdoor durability. The Exterior/Coloured Gaps variant does not list this UV additive in the supplied datasheet despite its name suggesting outdoor use — a discrepancy worth clarifying before specifying it for long-term weathering applications.

All three products require consulting separate technical data sheets for the application-critical details — cure times, substrate prep, paintability — that safety documents don't cover.

Frequently asked questions

What type of product is No More Big Gaps Expanding Foam: Expanding polyurethane foam filler

What type of product is No More Gaps Bricks & Mortar: Acrylic gap sealant

What type of product is No More Gaps Coloured Gaps/Exterior: Acrylic gap sealant

What is the pack size of No More Big Gaps Expanding Foam: 390ml aerosol canister

What is the pack size of No More Gaps Bricks & Mortar: 440g cartridge

What is the stated pack size of No More Gaps Coloured Gaps/Exterior: 450g nominal

What is the actual weight listed in the Coloured Gaps/Exterior datasheet: 430g

How many colour options does Bricks & Mortar offer: Five colours

What are the five colours available in Bricks & Mortar: Charcoal, Medium Grey, Off White, Sandstone, Terracotta

How many colour options does No More Big Gaps Expanding Foam offer: Not specified by manufacturer

What colour does No More Big Gaps Expanding Foam typically cure to: Tan or beige

How many colour options does Coloured Gaps/Exterior offer: Not specified by manufacturer in supplied datasheet

What chemistry does No More Big Gaps Expanding Foam use: Polyurethane

What chemistry do the two gap sealants use: Acrylic base

How does No More Big Gaps Expanding Foam cure: Moisture-activated chemical reaction

How do the acrylic sealants cure: Evaporative drying

What is the hazard signal word for No More Big Gaps Expanding Foam: Danger

What is the hazard signal word for Bricks & Mortar: Warning

What is the hazard signal word for Coloured Gaps/Exterior: Warning

Is No More Big Gaps Expanding Foam flammable: Yes, extremely flammable aerosol (H222)

Is Bricks & Mortar classified as a Dangerous Good: No

Is Coloured Gaps/Exterior classified as a Dangerous Good: No

Does No More Big Gaps Expanding Foam carry a carcinogenicity warning: Yes, suspected carcinogen (H351)

Does Bricks & Mortar carry a carcinogenicity warning: No

Does Coloured Gaps/Exterior carry a carcinogenicity warning: No

Is No More Big Gaps Expanding Foam a respiratory sensitiser: Yes (H334)

Is Bricks & Mortar a respiratory sensitiser: No

Does No More Big Gaps Expanding Foam cause organ damage with prolonged exposure: Yes (H372)

Does Bricks & Mortar cause organ damage: No

Is No More Big Gaps Expanding Foam safe during breastfeeding: No, may cause harm to breastfed children (H362)

What skin hazard do both acrylic sealants share: May cause allergic skin reaction (H317)

Does No More Big Gaps Expanding Foam also carry a skin sensitisation warning: Not listed as primary hazard

Is No More Big Gaps Expanding Foam safe in poorly ventilated spaces: No, requires excellent ventilation

Can Bricks & Mortar be used in poorly ventilated spaces: Yes, lower hazard profile permits this

What PPE is required for No More Big Gaps Expanding Foam: Protective equipment required per datasheet

What PPE is required for Bricks & Mortar: Protective gloves to avoid skin contact

What PPE is required for Coloured Gaps/Exterior: Protective gloves to avoid skin contact

What gap size is No More Big Gaps Expanding Foam designed for: Large gaps, approximately 20mm to 100mm or beyond

What gap size are the acrylic sealants designed for: Typically 3–25mm

For gaps exceeding 25mm, which product is recommended: No More Big Gaps Expanding Foam

Does No More Big Gaps Expanding Foam expand after application: Yes, expands two to three times dispensed volume

Do the acrylic sealants expand after application: No, they are non-expanding

Is Bricks & Mortar suitable for visible masonry joints: Yes

Is No More Big Gaps Expanding Foam suitable for visible joints: No, designed to be trimmed and concealed

Is Bricks & Mortar suitable for repointing mortar joints: Yes

What substrates does Bricks & Mortar target: Brick and mortar substrates

Does No More Big Gaps Expanding Foam adhere to wood: Yes, typically adheres to wood

Does No More Big Gaps Expanding Foam adhere to metal: Yes, typically adheres to metal

Does No More Big Gaps Expanding Foam adhere to masonry: Yes, typically adheres to masonry

Are substrate compatibility charts included in the safety datasheets: No

Where can substrate compatibility data be found: Separate Selleys technical data sheets

Does Bricks & Mortar contain a UV stabiliser: Yes, Bis-pentamethyl-piperidyl sebacate

Does Coloured Gaps/Exterior contain a UV stabiliser: Not listed in the supplied datasheet

What concentration is the UV stabiliser in Bricks & Mortar: Less than 1%

Does Bricks & Mortar contain biocides: Yes, BIT, CMIT, MIT, and OIT

Does Coloured Gaps/Exterior contain biocides: Yes, BIT, MIT, and OIT

Does No More Big Gaps Expanding Foam contain biocides: Not disclosed by manufacturer

Is Bricks & Mortar suitable for outdoor use: Yes, UV stabiliser supports outdoor durability

Is Coloured Gaps/Exterior confirmed suitable for long-term UV exposure: Unconfirmed, UV stabiliser not listed in datasheet

What does the "Exterior" designation on Coloured Gaps suggest: Formulated for outdoor weatherproofing applications

Is Bricks & Mortar paintable: Not specified by manufacturer

Is No More Big Gaps Expanding Foam paintable after curing: Not specified by manufacturer, but designed to be trimmed and painted

Are cure times listed in the safety datasheets: No

Are tack-free times listed in the safety datasheets: No

Where can cure time information be found: Selleys technical data sheets

Does Bricks & Mortar require painting after application: No, five pre-matched colours eliminate the need to paint

Does No More Big Gaps Expanding Foam require painting after application: Yes, typically trimmed and painted or concealed

Is No More Big Gaps Expanding Foam suitable for insulation applications: Yes, provides thermal resistance

Is No More Big Gaps Expanding Foam suitable for draft-proofing: Yes

Is Bricks & Mortar suitable for indoor use: Yes

Is Coloured Gaps/Exterior suitable for indoor use: Not specified in supplied documentation

Which product is safest for indoor use with limited ventilation: Either acrylic sealant (skin sensitisation risk only)

Which product poses the greatest health risk: No More Big Gaps Expanding Foam

Is the product naming consistent between the Coloured Gaps packaging and its datasheet: No, datasheet is labelled "Exterior" while product is called "Coloured Gaps"

Is there a pack size discrepancy for Coloured Gaps/Exterior: Yes, 450g stated vs 430g in datasheet

Should the Coloured Gaps/Exterior datasheet be verified before purchase: Yes, due to naming and weight discrepancies

What is the core decision when choosing between these three products: Foam versus sealant

Which product is best for gaps around window and door frames: No More Big Gaps Expanding Foam

Which product is best for filling cracks in brick walls with a colour match: No More Gaps Bricks & Mortar

Which product is best for general exterior gap sealing without masonry colour matching: No More Gaps Coloured Gaps/Exterior

Label facts summary

Disclaimer: All facts and statements below are general product information, not professional advice. Consult relevant experts for specific guidance.

Verified label facts

No More Big Gaps Expanding Foam 390ml

No More Gaps Bricks & Mortar 440g

No More Gaps Coloured Gaps/Exterior 450g

General product claims

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This guide compares three products from Selleys that all address gap filling but are designed for quite different situations. Selleys No More Big Gaps - Expanding Foam Filler 390ml sits at one end of the spectrum: it uses an expanding polyurethane foam that grows up to three times its dispensed volume, making it suited to large structural voids where volume and insulation matter more than a neat visible finish. It goes tack-free in around 15 minutes and fully cures in 4–5 hours, and once set it can be trimmed, sanded, and painted. Selleys No More Gaps Bricks and Mortar - 440g and Selleys No More Gaps Coloured Gaps - 450g, by contrast, are acrylic sealants aimed at joints and gaps where the finished surface will remain visible — masonry lines, exterior weatherproofing details, and colour-matched interior or exterior gaps where appearance is a priority.

Selleys is an Australian adhesives, sealants, and fillers brand with a broad range spanning gap fillers, construction adhesives, fillers, and cleaning products. The No More Gaps family is one of its most established product lines in the gap filler and sealant category, and the three products compared here each occupy a distinct niche within that family: foam-based void filling versus mortar-style repair versus colour-flexible acrylic sealing.

Within the category hierarchy — Home & Garden > Gap Fillers & Sealants — the key differentiator is substrate and scale. The expanding foam filler is the right choice when a gap is too large or irregular for a surface-applied sealant; the acrylic options are appropriate when the repair needs to blend into a masonry surface or match a specific colour. Someone using the foam filler for structural gaps around window frames or wall penetrations would likely also need a surface sealant like one of the No More Gaps acrylic products to finish the exposed face once the foam is trimmed back, making these products complementary rather than competing in many real-world projects.

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Product Data (OpenAI Spec)

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Specifications

Finish Semi-rigid closed cell
Cure Time 4–5 hrs (3–5 cm gaps)
Expansion 2.5–3× original volume
Technology Expanding polyurethane foam
Limitations Not suitable for underwater or continuously damp conditions. Not load-bearing or structural. Prolonged UV exposure may cause surface discolouration — paint if required.
Paintability Yes, once cured
Tack-Free Time ~15 mins
Directions for Use 1. Clean and dampen surfaces for best adhesion. 2. Shake can well and attach nozzle. 3. Hold can upside down and apply foam into gap (fill to ~1/3, it will expand). 4. Allow to cure (4–5 hrs for 3–5 cm gaps). 5. Once cured, trim, sand, and paint if desired.
Important Information Foam expands significantly (2.5–3×) — avoid overfilling. Shake can well before use. Protect surrounding surfaces from overspray.
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