AI Summary

Product: Selleys No More Cracks Exterior Brick & Render Filler Brand: Selleys (a division of DuluxGroup Australia Pty Ltd) Category: Exterior Masonry Crack Repair Filler Primary Use: Ready-to-use grey paste for repairing cracks in exterior brick and render masonry surfaces.

Quick Facts

Best For: Trade professionals and DIY users repairing exterior masonry cracks on brick and rendered walls
Key Benefit: Non-slumping, thermally stable, non-combustible formulation that holds up under outdoor conditions including temperature swings, moisture, and UV exposure
Form Factor: Ready-to-use paste (500g container, no mixing required)
Application Method: Press firmly into prepared crack using a filling knife or putty knife; overfill slightly and sand flush once dry

Common Questions This Guide Answers

Is this product suitable for structural crack repair? → No; non-structural repairs only — structural cracks must be assessed by a licensed builder or structural engineer before any cosmetic repair
What safety precautions are required? → Classified as Skin Sensitiser Category 1 (H317); wear nitrile gloves, safety glasses, overalls, and safety shoes; use P1/P2 respirator when sanding
Does this product require special transport or storage handling? → No; not classified as Dangerous Goods for road, air, or marine transport; store in a cool, dry, well-ventilated location away from sunlight — do not freeze

Product Overview

Selleys No More Cracks Exterior Brick & Render Filler does exactly what the name says: it's a ready-to-use grey paste that repairs cracks in exterior masonry — brick, render, and the surfaces in between. Made by Selleys, a division of DuluxGroup Australia Pty Ltd, it's built for trade professionals and DIY users who need a weather-resistant repair that actually holds up outdoors.

Exterior masonry repair is genuinely demanding work. Temperature swings, moisture, UV exposure, and the constant physical stress of building movement mean interior fillers simply aren't up to the task. This product handles all of that with a thermally stable, non-combustible formulation that stays intact under real outdoor conditions. The 500g format suits targeted, precise repairs — cracks in rendered walls, brick joints, and similar masonry surfaces — so you get professional results where you need them.

This guide covers everything you need to use this product correctly, safely, and effectively: what it is, how it works, how to apply it, how to store it, and what precautions to take. Follow it through and you'll get the result right the first time.

Understanding the Product Formulation

Physical Properties

Selleys No More Cracks Exterior Brick & Render Filler comes as a paste with these physical characteristics:

Colour: Grey
Form: Paste
Odour: Characteristic (mild; not strongly solvent-based)
Specific gravity: 1.01–1.05
Viscosity: 6,000–9,000 Poise (P)

Specific gravity (1.01–1.05) tells you the density of the paste relative to water. Just above 1.0 means this filler is only slightly denser than water — a relatively lightweight paste, not a heavy cement-based compound. That translates into smooth, easy application by hand or tool.

Viscosity (6,000–9,000 Poise) tells you how thick the paste is and how it resists flow. Water sits at around 0.01 Poise; honey comes in at 100–1,000 Poise. At 6,000–9,000 Poise, this is a very thick, non-slumping paste. It stays exactly where you put it on vertical surfaces, holding firm in cracks in rendered walls or brick faces rather than running or sagging before it cures.

Chemical Stability

The formulation is chemically stable under normal working conditions and is classified as non-combustible. On a construction site or in storage alongside other materials, that's a straightforward advantage — no fire hazard during application or storage.

Key Features and Their Benefits

Exterior-Specific Design

This filler is built specifically for exterior use on brick and render — two of the most common masonry surfaces on Australian homes and commercial buildings. Render cracks due to thermal expansion, shrinkage during curing, and minor structural movement. Brick mortar joints develop hairline and wider cracks over time. A filler designed for these surfaces bonds correctly to the alkaline, porous nature of masonry. A general-purpose filler won't deliver the same results, and on exterior surfaces exposed to the elements, that gap matters.

Thermal Stability

The thermally stable formulation means the cured filler holds across the full temperature range of Australian exterior conditions — from cool winter mornings to hot summer afternoons. Exterior surfaces face significant daily and seasonal temperature swings, and a filler that expands and contracts out of step with the surrounding masonry will crack or pull away over time. Thermal stability keeps the repair intact through every cycle.

Non-Combustible Classification

Non-combustible means this product doesn't contribute to fire under standard conditions — a practical safety advantage during storage and application, particularly where ignition sources may be nearby.

Transport Safety

This product is not classified as Dangerous Goods under Australian and New Zealand transport regulations, covering road and rail transport, air transport (IATA criteria), and marine transport (IMDG criteria). You can buy it through standard retail channels, carry it in your vehicle, and get straight to work.

Practical Applications and Use Cases

Selleys No More Cracks Exterior Brick & Render Filler suits a range of exterior masonry repairs:

Hairline and moderate cracks in rendered walls — including cement render and acrylic render surfaces on brick veneer and double-brick homes
Cracks in brick surfaces — surface cracks in the brick face itself (not structural movement cracks, which need professional assessment)
Mortar joint repairs — minor deterioration or cracking in the mortar between bricks
Preparation for repainting — filling surface imperfections before applying exterior paint to achieve a smooth, uniform finish

Important limitation: This product is for non-structural crack repair only. Wide cracks, recurring cracks, or cracks associated with visible building movement — stair-step cracking in brickwork or large horizontal cracks — may point to structural issues. Have these assessed by a licensed builder or structural engineer before any cosmetic repair begins.

Application Guidance

Surface Preparation

Surface preparation is the foundation of every successful repair. Before applying the filler:

Remove loose material. Use a scraper, wire brush, or chisel to clear away loose render, crumbling mortar, or flaking paint from inside and around the crack. Applying filler over a loose substrate means the repair won't hold.
Clean the area. Remove dust, dirt, oil, and any biological growth (moss, lichen) from the repair zone. Contaminants block adhesion. A stiff brush and clean water are usually all you need — let the surface dry before moving on.
Widen very fine cracks if needed. Hairline cracks can be too narrow for the paste to penetrate effectively. Use a scraper or cold chisel to open the crack slightly — this also creates a mechanical key for the filler to bond into, giving you a stronger, longer-lasting repair.
Ensure the surface is dry. Never apply to wet or damp surfaces. Moisture trapped beneath the filler will undermine adhesion and affect curing.

Applying the Filler

Open the container and stir the paste if any separation has occurred during storage.
Apply the filler directly to the crack using a filling knife, putty knife, or similar tool. Press the paste firmly into the crack to ensure full contact with the substrate and eliminate air voids.
Overfill slightly. The filler may shrink a little as it dries. A slightly raised layer gives you material to sand back to a flush finish once dry.
Smooth the surface. Use a damp filling knife or gloved finger to feather the edges of the repair into the surrounding surface.
Allow to dry fully before sanding, painting, or exposing to rain. Drying time varies with temperature, humidity, and fill depth — deeper fills take longer than shallow surface repairs. Check the product label for manufacturer-specified drying times.
Sand and finish. Once fully dry, sand the repair smooth and flush with the surrounding surface. The grey colour is designed to be painted over — apply an appropriate exterior paint to match the surrounding area.

Tips for Best Results

Work in moderate conditions. Direct hot sunlight can cause the surface to dry too fast and crack. Rain during the drying period, or temperatures near or below freezing, will also affect the outcome.
For deep cracks, apply in layers. A single thick pass on a deep crack increases the risk of shrinkage cracking. Apply in multiple layers, letting each dry before adding the next.
Prime before painting if required. On highly porous surfaces, or when applying a light-coloured topcoat, a primer coat improves paint adhesion and colour uniformity over the repair.

Storage Instructions

Store in a cool, dry, well-ventilated location away from direct sunlight and heat sources.
Keep the container tightly sealed after every use — this is what keeps the paste workable.
Do not freeze. Freezing temperatures alter the paste consistency and affect performance.
Keep out of reach of children.

The non-combustible classification means no segregated flammable storage is required, but store away from food, beverages, and animal feed as a matter of course.

Safety Considerations and Precautions

Hazard Classification

Selleys No More Cracks Exterior Brick & Render Filler is classified as a Skin Sensitiser Category 1 under the Globally Harmonised System (GHS) of Classification and Labelling of Chemicals. The relevant hazard statement is:

H317 — May cause an allergic skin reaction.

Skin sensitisation means repeated or prolonged skin contact can cause some individuals to develop an allergic reaction. Once sensitised, even minor exposure can trigger a response. This isn't unusual for masonry repair products, which often contain compounds — such as chromates or other alkaline materials — known as potential skin sensitisers. Wearing the right PPE keeps you protected.

Recommended Personal Protective Equipment (PPE)

Wear the following when handling and applying this product:

PPE Item	Purpose
Nitrile gloves	Prevent skin contact and sensitisation
Safety glasses	Protect eyes from splashes or dust
Overalls or protective clothing	Prevent skin contact on arms and body
Safety shoes	Protect feet from spills or dropped containers

When sanding dried filler — especially in confined or poorly ventilated spaces — wear an appropriate dust mask or respirator (P1 or P2 rated) to avoid breathing fine dust particles.

First Aid Measures

Skin contact:

Remove any contaminated clothing immediately.
Flush the affected skin with running water for several minutes.
If irritation or allergic reaction develops, seek medical advice.

Eye contact:

Wash eyes immediately and thoroughly with clean, running water.
Hold eyelids open during washing to ensure full rinsing.
Seek medical advice if irritation persists.

If swallowed:

Do not induce vomiting.
Rinse mouth with water.
Seek medical advice immediately and show the product label or Safety Data Sheet to the treating medical professional.

Inhalation:

Move to fresh air.
If symptoms persist, seek medical advice.

Ventilation

When working in enclosed or semi-enclosed areas — an internal courtyard, covered patio, or enclosed garage — ensure adequate ventilation. The product has a mild characteristic odour and isn't solvent-heavy, but good airflow is always the right call when working with construction materials.

Troubleshooting Common Issues

The filler is cracking after drying. This usually comes down to applying too thick a layer in a single pass, or working in high ambient or surface temperatures. For deep repairs, build up the filler in multiple thinner layers and allow each to dry fully. Avoid direct sunlight on hot days.

The filler is not adhering properly. Poor adhesion points directly to surface preparation. Confirm the substrate is clean, dry, and free of loose material before application. On smooth or painted surfaces, lightly abrading the area first creates the mechanical grip the filler needs to bond.

The repair is visible after painting. If the repaired area shows through the topcoat, the filler surface is likely more porous than the surrounding render, causing uneven paint absorption. Apply a coat of exterior primer over the repair before painting — this equalises porosity and delivers a uniform finish.

The paste has dried out in the container. This happens when the lid isn't sealed tightly after use. If the paste has partially dried, working in a small amount of water may restore workability. If the product has fully hardened, it cannot be reconstituted and should be disposed of appropriately.

References

Frequently Asked Questions

What is Selleys No More Cracks Exterior Brick & Render Filler: A ready-to-use exterior masonry crack repair paste

Who manufactures this product: Selleys, a division of DuluxGroup Australia Pty Ltd

What colour is the filler: Grey

What form does the product come in: Paste

What size is the container: 500g

Is this product ready to use: Yes, no mixing required

Is this product designed for interior use: No, it is designed for exterior use only

Is this product designed for exterior use: Yes

What surfaces is it designed for: Brick and render masonry surfaces

Can it be used on rendered walls: Yes

Can it be used on brick surfaces: Yes

Can it be used on mortar joints: Yes, for minor deterioration or cracking

Is it suitable for structural crack repair: No, non-structural repairs only

What should you do before repairing a structural crack: Have it assessed by a licensed builder or structural engineer

What is the specific gravity of the product: 1.01–1.05

What does the specific gravity indicate: The paste is only slightly denser than water

What is the viscosity of the product: 6,000–9,000 Poise

What does the high viscosity mean for application: The paste is non-slumping and stays where applied

Will the filler sag on vertical surfaces: No, the high viscosity prevents sagging

Is the product chemically stable: Yes, under normal working conditions

Is the product combustible: No, it is classified non-combustible

Does the product pose a fire hazard during storage: No

Does the product pose a fire hazard during application: No

Is this product classified as Dangerous Goods for road transport: No

Is this product classified as Dangerous Goods for air transport: No, does not meet IATA criteria

Is this product classified as Dangerous Goods for marine transport: No, does not meet IMDG criteria

Does transporting this product require special handling: No

What is the hazard classification of this product: Skin Sensitiser Category 1 under GHS

What is the relevant hazard statement: H317 — May cause an allergic skin reaction

Can repeated skin contact cause sensitisation: Yes

Once sensitised, can minor exposure trigger a reaction: Yes

What gloves should be worn when using this product: Nitrile gloves

Should safety glasses be worn during application: Yes

Should protective clothing be worn during application: Yes, overalls or protective clothing

Should safety shoes be worn during application: Yes

Should a dust mask be worn when sanding dried filler: Yes, P1 or P2 rated respirator

What should you do if the product contacts skin: Flush with running water for several minutes

Should contaminated clothing be removed after skin contact: Yes, immediately

What should you do if the product contacts eyes: Wash immediately with clean running water for several minutes

Should eyelids be held open during eye washing: Yes

When should you seek medical advice after eye contact: If irritation persists

Should vomiting be induced if the product is swallowed: No

What should you do if the product is swallowed: Rinse mouth with water and seek medical advice immediately

What should you do if the product is inhaled: Move to fresh air

Is ventilation required during application: Yes, especially in enclosed areas

Should the product be applied to wet surfaces: No, surfaces must be dry

Should loose material be removed before application: Yes

What tools can be used to remove loose material: Scraper, wire brush, or chisel

Should dust and dirt be removed before application: Yes

What should be done to very fine hairline cracks before filling: Widen slightly with a scraper or cold chisel

Why should hairline cracks be widened before filling: To allow paste penetration and create a mechanical key

Should the filler be overfilled slightly: Yes, to account for shrinkage during drying

How should the filler be applied: Press firmly into the crack using a filling knife or putty knife

Why should filler be pressed firmly into the crack: To eliminate air voids and ensure full substrate contact

Can a gloved finger be used to smooth the filler: Yes

Should the filler be sanded after drying: Yes, to achieve a flush finish

Can the filler be painted over: Yes

What colour topcoat is recommended: An appropriate exterior paint to match the surrounding area

Should primer be applied before painting over the repair: Yes, on highly porous surfaces or with light-coloured topcoats

Why does the repaired area sometimes show through paint: The filler surface is more porous, causing uneven paint absorption

What causes filler to crack after drying: Applying too thick a layer in a single pass

What else causes filler to crack after drying: Working in high ambient or surface temperatures

How should deep cracks be filled: In multiple thinner layers, allowing each to dry before adding the next

What causes poor adhesion of the filler: Insufficient surface preparation

How can adhesion be improved on smooth or painted surfaces: Lightly abrade the surface before application

Should the filler be applied in direct hot sunlight: No, it can cause the surface to dry too fast and crack

Should the filler be applied in freezing temperatures: No, freezing affects the outcome

Should the filler be applied during rain: No

How should the container be stored: In a cool, dry, well-ventilated location

Should the container be stored in direct sunlight: No

Should the filler be allowed to freeze: No, freezing alters paste consistency and affects performance

Should the container be kept tightly sealed after use: Yes

What happens if the container is not sealed after use: The paste can dry out

Can partially dried paste be restored: Possibly, by working in a small amount of water

Can fully hardened paste be reconstituted: No

Should the product be stored near food: No

Should the product be kept away from children: Yes

What is the odour of the product: Mild, characteristic odour

Is the product strongly solvent-based: No

Is this product suitable for DIY users: Yes

Is this product suitable for trade professionals: Yes

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

Product name: Selleys No More Cracks Exterior Brick & Render Filler
Manufacturer: Selleys, a division of DuluxGroup Australia Pty Ltd
Container size: 500g
Form: Paste (ready to use, no mixing required)
Colour: Grey
Odour: Mild, characteristic (not strongly solvent-based)
Specific gravity: 1.01–1.05
Viscosity: 6,000–9,000 Poise
Intended use: Exterior crack repair on brick and render masonry surfaces
Interior use: Not designed for interior use
Structural repair suitability: Not suitable for structural crack repair
Chemical stability: Stable under normal working conditions
Combustibility: Classified non-combustible
Dangerous Goods classification (road/rail): Not classified as Dangerous Goods
Dangerous Goods classification (air): Does not meet IATA criteria
Dangerous Goods classification (marine): Does not meet IMDG criteria
Hazard classification: Skin Sensitiser Category 1 under the Globally Harmonised System (GHS)
Hazard statement: H317 — May cause an allergic skin reaction
Recommended PPE — gloves: Nitrile gloves
Recommended PPE — eye protection: Safety glasses
Recommended PPE — body protection: Overalls or protective clothing
Recommended PPE — foot protection: Safety shoes
Recommended PPE — sanding: P1 or P2 rated dust mask or respirator
First aid — skin contact: Remove contaminated clothing; flush with running water for several minutes; seek medical advice if reaction develops
First aid — eye contact: Wash immediately with clean running water, hold eyelids open; seek medical advice if irritation persists
First aid — swallowed: Do not induce vomiting; rinse mouth with water; seek medical advice immediately
First aid — inhalation: Move to fresh air; seek medical advice if symptoms persist
Storage: Cool, dry, well-ventilated location; away from direct sunlight and heat sources
Freezing: Do not freeze; alters paste consistency and affects performance
Container sealing: Keep tightly sealed after use
Keep out of reach of children: Yes
Storage near food: Do not store near food, beverages, or animal feed
Surface requirements: Apply to clean, dry surfaces only; do not apply to wet or damp surfaces
Application method: Filling knife, putty knife, or similar tool; press firmly into crack to eliminate air voids
Deep crack application: Apply in multiple layers, allowing each layer to dry before adding the next
Overfilling: Overfill slightly to account for shrinkage during drying
Paintable: Yes; apply appropriate exterior paint over cured, sanded repair
Partially dried paste: May be restored by working in a small amount of water
Fully hardened paste: Cannot be reconstituted

General Product Claims

Suitable for trade professionals and DIY users
Weather-resistant repair that holds up outdoors
Thermally stable formulation maintains integrity under real outdoor working conditions
Non-slumping paste stays where applied on vertical surfaces without running or sagging
Bonds correctly to the alkaline, porous nature of masonry surfaces
Thermal stability keeps the repair intact through temperature cycles, season after season
Non-combustible classification is a safety advantage in environments where ignition sources may be nearby
Grey colour is designed to be painted over for a seamless finish
Primer coat improves paint adhesion and colour uniformity over the repair on porous surfaces
Lightly abrading smooth or painted surfaces improves adhesion
Working in moderate conditions (avoiding direct hot sunlight, rain, or freezing temperatures) produces best results
500g format suits targeted, precise repairs

Selleys No More Cracks Exterior Brick & Render 01 product guide