AI Summary

Product: Selleys No More Cracks Exterior Brick & Render Filler Brand: Selleys (a division of DuluxGroup Australia Pty Ltd) Category: Exterior Masonry Repair Filler Primary Use: Repairing hairline and moderate surface cracks in exterior brick and render masonry surfaces.

Quick facts

Best for: Trade professionals and DIY users performing small-to-medium exterior masonry repairs
Key benefit: Non-slumping, thermally stable paste formulated to hold up outdoors against moisture, UV exposure, and temperature swings
Form factor: Grey paste (500g container)
Application method: Apply with filling knife, putty knife, or gloved finger; press firmly into crack; build deep cracks in 5–10mm layers

Common questions this guide answers

Is this filler safe to handle with bare hands? → No — it is classified as Skin Sensitiser Category 1 (H317); nitrile gloves, safety glasses, overalls, and safety shoes are required
Can this product be used for structural or actively moving cracks? → No — it is not formulated for structural repair, expansion joint filling, or flexible movement accommodation; use a flexible sealant or seek professional structural assessment instead
How long should the filler cure before painting? → The filler must be completely cured before painting; applying paint too early traps moisture and undermines adhesion; a masonry primer is recommended before topcoating

Product overview

Selleys No More Cracks Exterior Brick & Render Filler is a grey paste compound built for one purpose: lasting repairs to exterior masonry surfaces, including brick and render. Manufactured by Selleys, a division of DuluxGroup Australia Pty Ltd, it's designed for trade professionals and DIY users working outdoors.

Interior fillers aren't up to exterior demands. Exterior masonry repair means facing temperature swings, moisture, UV exposure, and the natural movement of masonry substrates. This filler handles all of that through a thermally stable, non-combustible formulation that holds its chemical integrity under normal working conditions — the kind of performance that keeps repairs looking right on an exposed exterior wall, not just for a season but long-term.

The 500g pack is well-suited to small-to-medium repair jobs: hairline cracks in rendered walls, damaged mortar joints, or surface cracks in brick from settling or seasonal movement.

What the specifications tell you

Knowing the physical properties of this filler puts you in control. Apply it correctly, set realistic expectations, and get the results you're after the first time.

Form and consistency

The product is supplied as a paste with a specific gravity of 1.01–1.05. Specific gravity describes how dense the material is relative to water. A value just above 1.0 means the paste sits only marginally denser than water — relatively lightweight, not a heavy, aggregate-laden compound. That density is right for surface crack repair rather than structural gap filling.

Viscosity is rated at 6,000–9,000 Poise (P). Poise measures dynamic viscosity. For context, water sits at roughly 0.01P, while honey lands around 100–200P. At 6,000–9,000P, this filler is a thick, non-slumping paste that holds its shape on a vertical surface without running or sagging. On an exterior wall, where gravity is always working against you, that consistency matters for a professional result.

Colour

The filler dries grey, which is a deliberate choice for masonry applications. Render and concrete substrates are typically grey in tone, making this a practical starting point for blending repairs into the surrounding surface. For brick surfaces, colour matching depends on the specific brick type; painting over the cured repair with an appropriate exterior masonry paint is the proven approach for a seamless finish.

Odour

The product carries a characteristic odour, typical of paste-based fillers containing binders and additives. Good ventilation during application is always worth doing — even outdoors, particularly in enclosed courtyards or sheltered alcoves where air movement is limited.

Suitable applications

This filler is purpose-built for exterior masonry surfaces, specifically:

Brick: Surface cracks, spalled faces, and minor impact damage
Render: Hairline and moderate cracks in cement or acrylic render coatings applied over masonry

It is not formulated for structural crack repair, expansion joint filling, or applications requiring flexible movement accommodation. Masonry cracks that are actively moving — caused by subsidence, live structural loads, or inadequate expansion joints — need a flexible sealant or a professional structural assessment, not a rigid filler. Knowing the right tool for the job is what separates a lasting repair from a short-term patch.

This product is rated for exterior use, meaning it's built to withstand real outdoor conditions. Interior-grade fillers applied externally deteriorate prematurely under moisture and thermal cycling. Using a product formulated for exterior masonry eliminates that problem from the start.

Preparation and application

Surface preparation is what separates a repair that lasts from one that doesn't. A filler pressed into a poorly prepared surface won't perform, regardless of product quality.

Surface preparation

Remove loose material: Use a scraper, wire brush, or cold chisel to clear any loose render, crumbling mortar, or friable brick from the crack. The repair area must be structurally sound before you apply anything.
Clean the surface: Remove dust, dirt, oil, and any biological growth such as moss or algae. A stiff brush and clean water handle most surfaces; contaminated areas may need a suitable masonry cleaner.
Dampen the substrate: Dry masonry is highly absorbent and pulls moisture rapidly from the filler — a leading cause of shrinkage and poor adhesion. A light dampening of the crack before application helps the filler bond and cure correctly. Damp, not saturated, is the target.

Application

Apply the filler directly from the container using a filling knife, putty knife, or gloved finger for narrow cracks.
Press the filler firmly into the crack to eliminate voids and ensure full contact with the substrate.
Overfill slightly to account for minor shrinkage during curing, then smooth flush with the surrounding surface once the filler begins to firm up.
For deeper cracks, build up in multiple layers rather than one thick application. Allow each layer to dry fully before applying the next. Skipping this step leads to surface skinning over an uncured core, which causes cracking and rework.
Working temperature and humidity both affect cure time. Follow any guidance on the product packaging for your specific conditions.

Finishing

Once fully cured, sand the surface smooth where needed. The grey finish accepts exterior masonry paint, letting you match the surrounding surface. Always confirm the filler is completely cured before painting — applying paint too early traps moisture and undermines adhesion. Patience here pays off in the finished result.

Storage instructions

Store the product in cool, dry, well-ventilated conditions, away from direct sunlight. Heat and UV exposure alter the consistency of paste-based fillers and shorten shelf life. Seal the container tightly after every use to keep the paste in working condition and prevent skinning.

Keep away from heat sources, open flames, and oxidising agents — even though this product is non-combustible under normal conditions.

Safety information

Read this section before you open the container.

Skin sensitiser classification

The product is classified as a Skin Sensitiser Category 1 (Hazard Statement H317: May cause an allergic skin reaction). This is a formal regulatory classification under the Globally Harmonised System (GHS) of Classification and Labelling of Chemicals.

In practice, repeated or prolonged skin contact with the filler can cause sensitisation in some individuals. Once sensitised, even minor future contact can trigger an allergic reaction. The right approach is straightforward: avoid skin contact from the start. Don't assume a single exposure is without consequence.

Required personal protective equipment (PPE)

PPE item	Purpose
Nitrile gloves	Prevent skin contact and sensitisation
Safety glasses	Protect eyes from splashing or dust
Overalls	Protect skin on arms and body
Safety shoes	Protect feet during mixing or application

Nitrile gloves are the right choice here — they offer better chemical resistance than standard latex. Avoid breathing dust generated during surface preparation or when sanding cured filler.

First aid procedures

Skin contact: Remove contaminated clothing immediately. Flush the affected area with running water. If irritation persists, seek medical advice.

Eye contact: Wash eyes immediately with clean, running water for several minutes. Hold eyelids open to ensure thorough rinsing. Seek medical advice if irritation continues.

Ingestion: Do not induce vomiting. Seek medical advice or contact the Poisons Information Centre (Australia: 13 11 26).

Inhalation: Move to fresh air immediately. If symptoms persist, seek medical attention.

Transport classification

The product is not classified as Dangerous Goods for transport by road, rail, air (IATA), or marine (IMDG) routes under Australian and New Zealand regulations. No special transport documentation or hazardous goods handling is required for purchasing, delivering, or carrying this product.

Tips for best results

These are the details that separate a repair that holds from one that needs redoing.

Never skip dampening: Dry masonry is one of the most common reasons exterior repairs fail. A quick mist with a spray bottle before application makes a measurable difference to adhesion and long-term performance.
Build deep cracks up in stages: A single thick application regularly produces surface cracking as the outer layer cures faster than the core. Build up in layers of no more than 5–10mm at a time for a result that lasts.
Investigate before you fill: If a crack has reappeared after a previous repair, look into the underlying cause — drainage issues, structural movement, or inadequate expansion joints — before filling again. Addressing the cause is what turns a recurring problem into a permanent fix.
Sand between coats: Lightly sanding each dried layer before applying the next improves mechanical adhesion between layers and sets up a stronger finished surface.
Prime before painting: A masonry primer applied over the cured filler before topcoating improves paint adhesion and reduces the risk of the repair showing through as a different texture or sheen level. It's a small step that makes a visible difference.
Choose your conditions: Avoid application in direct hot sun, freezing temperatures, or when rain is forecast within the cure window. Extreme conditions affect how the filler cures and can undermine the finished result.

References

Note: Specific Safety Data Sheet (SDS) documentation was referenced from manufacturer-provided product data. Readers should obtain the current SDS directly from Selleys or DuluxGroup for the most up-to-date regulatory and safety information.

Frequently asked questions

What is Selleys No More Cracks Exterior Brick & Render Filler: A grey paste compound for exterior masonry repairs

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

What form does the product come in: Paste

What colour does the filler dry to: Grey

What is the pack size: 500g

Is this product suitable for exterior use: Yes

Is this product suitable for interior use: Not formulated for interior use

What surfaces is it designed for: Exterior masonry surfaces

Is it suitable for brick repairs: Yes

Is it suitable for render repairs: Yes

Is it suitable for structural crack repair: No

Is it suitable for expansion joint filling: No

Is it suitable for flexible movement accommodation: No

What type of cracks can it repair: Hairline and moderate surface cracks

Can it repair mortar joints: Yes

Can it repair spalled brick faces: Yes

Can it repair minor impact damage on brick: Yes

Should actively moving cracks be filled with this product: No

What should be used for actively moving cracks: A flexible sealant or professional structural assessment

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

What does a specific gravity just above 1.0 indicate: The paste is only marginally denser than water

Is this a heavy aggregate-laden compound: No

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

Does the filler slump or sag on vertical surfaces: No

Why does the filler hold shape on vertical surfaces: High viscosity of 6,000–9,000 Poise prevents slumping

Does the product have an odour: Yes, a characteristic odour

Is ventilation recommended during application: Yes

Is ventilation required even outdoors: Yes, especially in enclosed or sheltered areas

Is the product non-combustible: Yes, under normal conditions

Is the product thermally stable: Yes

What is the skin hazard classification: Skin Sensitiser Category 1

What is the GHS hazard statement code: H317

What does H317 mean: May cause an allergic skin reaction

Can repeated skin contact cause sensitisation: Yes

Once sensitised, can minor contact trigger a reaction: Yes

What gloves should be worn: Nitrile gloves

Why are nitrile gloves recommended over latex: Superior chemical resistance

Is eye protection required: Yes, safety glasses

Are overalls recommended: Yes

Are safety shoes recommended: Yes

What should be done if skin contact occurs: Remove contaminated clothing and flush with running water

Should vomiting be induced if ingested: No

What is the Australian Poisons Information Centre number: 13 11 26

What should be done if eye contact occurs: Wash immediately with clean running water for several minutes

Should eyelids be held open during eye rinsing: Yes

What should be done if inhaled: Move to fresh air immediately

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

Is the product classified as Dangerous Goods for air transport (IATA): No

Is the product classified as Dangerous Goods for marine transport (IMDG): No

Is special transport documentation required: No

How should the surface be prepared before application: Remove loose material, clean, and dampen the substrate

Why should the substrate be dampened before application: Dry masonry pulls moisture from filler, causing shrinkage and poor adhesion

Should the substrate be saturated before application: No, only lightly dampened

What tools can be used to apply the filler: Filling knife, putty knife, or gloved finger

Should the filler be pressed firmly into the crack: Yes, to eliminate voids

Should the crack be overfilled or underfilled: Slightly overfilled to account for shrinkage

How should deep cracks be filled: In multiple layers, not one thick application

What is the recommended maximum layer thickness: 5–10mm per layer

Must each layer dry before applying the next: Yes, fully

Can the cured filler be sanded: Yes

Does the grey finish accept exterior masonry paint: Yes

Should filler be fully cured before painting: Yes

What happens if paint is applied before full cure: Trapped moisture undermines adhesion

Is priming recommended before painting: Yes, a masonry primer

Why use a masonry primer over cured filler: Improves paint adhesion and reduces texture differences

Should cracks be investigated before refilling if they recur: Yes

Should layers be sanded between coats: Yes, lightly

Should application be avoided in direct hot sun: Yes

Should application be avoided in freezing temperatures: Yes

Should application be avoided before rain: Yes, within the cure window

How should the product be stored: In cool, dry, and well-ventilated conditions

Should the product be stored away from direct sunlight: Yes

Why avoid sunlight during storage: Heat and UV alter paste consistency and shorten shelf life

Should the container be sealed after use: Yes, tightly

Should the product be kept away from heat sources: Yes

Should the product be kept away from open flames: Yes

Should the product be kept away from oxidising agents: Yes

Is this product job-size appropriate for small-to-medium repairs: Yes

Is this product appropriate for large-scale structural repairs: No

What job classification is this product suited for: Trade professionals and DIY users

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
Pack size: 500g
Form: Paste
Colour (dried): Grey
Specific gravity: 1.01–1.05
Viscosity: 6,000–9,000 Poise
Odour: Characteristic odour
Intended use: Exterior masonry surfaces (brick and render)
Not suitable for: Structural crack repair, expansion joint filling, flexible movement accommodation, interior use
Non-combustible: Yes, under normal conditions
Thermally stable: Yes
Skin hazard classification: Skin Sensitiser Category 1
GHS hazard statement: H317 — May cause an allergic skin reaction
Required PPE: Nitrile gloves, safety glasses, overalls, safety shoes
First aid — skin contact: Remove contaminated clothing; flush with running water
First aid — eye contact: Wash immediately with clean running water for several minutes; hold eyelids open
First aid — ingestion: Do not induce vomiting; contact Poisons Information Centre (Australia: 13 11 26)
First aid — inhalation: Move to fresh air immediately
Dangerous goods classification (road): Not classified
Dangerous goods classification (air — IATA): Not classified
Dangerous goods classification (marine — IMDG): Not classified
Special transport documentation required: No
Storage: Cool, dry, well-ventilated conditions; away from direct sunlight, heat sources, open flames, and oxidising agents
Container: Seal tightly after use
Application method: Filling knife, putty knife, or gloved finger
Deep crack application: Multiple layers; maximum 5–10mm per layer; each layer must dry fully before next application
Painting: Accepts exterior masonry paint; filler must be fully cured before painting
Sanding: Cured filler can be sanded smooth

General product claims

Interior fillers are inadequate for exterior masonry demands
The formulation holds chemical integrity under normal working conditions
The filler delivers professional, lasting repairs
High viscosity makes the product reliable for professional results on vertical surfaces
Grey colour is a practical starting point for blending into masonry surfaces
Dampening the substrate makes a measurable difference to adhesion and long-term performance
Building deep cracks up in layers produces results that last
Applying a masonry primer before topcoating improves paint adhesion and reduces texture differences
Using an exterior-formulated product eliminates premature deterioration caused by moisture and thermal cycling
Investigating recurring cracks before refilling turns a recurring problem into a permanent fix
Nitrile gloves offer better chemical resistance than standard latex

Selleys No More Cracks Exterior Brick & Render 04 product guide