Selleys Spakfilla Heavy Duty Wall Filler 435g product guide

AI Summary Product: Selleys Spakfilla Heavy Duty Brand: Selleys (a division of DuluxGroup (Australia) Pty Ltd) Category: Multi-purpose, tough and durable, weather-resistant ready-mixed filler Primary Use: Interior and exterior substantial filling in mortar, wood, brick, masonry, stone, plaster, concrete, and primed metal surfaces. Quick Facts

Best For: Large gaps and cracks requiring substantial filling. Interior and exterior. Multi-surface: mortar, wood, brick, masonry, stone, plaster, concrete, primed metal. Key Benefit: Tough and durable. Weather resistant. Minimal shrinkage — no need to overfill. For deeper cracks, apply in 6mm layers allowing each to dry. Easy to sand to a feathered edge. Form Factor: Light grey smooth paste in 435g (385mL) tub with flexible spatula. Water based. Ready mixed. Safety: ✅ NON-Hazardous, NON-Dangerous Goods — not classified as hazardous per Safe Work Australia GHS 7. PPE still recommended: safety shoes, overalls, gloves, safety glasses. Drying Time: 2–3 hours for 2mm applications. Allow longer for thicker applications and colder weather. Not Suitable For: Below 5°C or wet conditions. Not for building movement (use No More Gaps). Exterior surfaces must be primed before application and painted to protect from rain.

Common Questions This Guide Answers

How deep can I fill? → Apply in 6mm layers for deeper cracks, allowing each layer to dry before the next. How long to dry? → 2–3 hours for 2mm applications. Allow longer for thicker applications and in colder weather. Can I use it outside? → Yes — weather resistant. Prime exterior surfaces before application. Protect from rain until dry and painted with two coats of paint. What surfaces does it work on? → Mortar, wood, brick, masonry, stone, plaster, concrete, and primed metal. Is it hazardous? → No — NON-Hazardous per SDS. PPE still recommended as good practice.

Contents

Safety: This Product Is NON-Hazardous Recommended PPE Product Overview Prepare the Surface Apply the Filler Drying Times Sand and Finish Paint the Repair Clean Up and Storage Know the Limitations Tips for Best Results Troubleshoot Common Problems Your Pre-Application Checklist First Aid Information References Product Facts Label Facts Summary Frequently Asked Questions

Product Facts AttributeValueProduct nameSelleys Spakfilla Heavy DutyFull SDS nameSPAKFILLA HEAVY DUTYBrandSelleys (DuluxGroup)Recommended useWeather resistant filler for use on plaster, timber, concrete brick & stoneDescriptionMulti-purpose, tough and durable, light grey ready-mixed fillerAppearanceSmooth pasteColourGrey (TDS) / Light grey (SDS)OdourMild, characteristicTechnologyWater basedSpecific gravity1.08 – 1.18Viscosity>5,000PSolubilityDispersible in waterPackaging435g (385mL) tub with flexible spatulaUsesInterior and exterior: mortar, wood, brick, masonry, stone, plaster, concrete, primed metalDrying/sanding/painting time2–3 hours for 2mm. Allow longer for thicker or colder.Layer depth6mm layers for deeper cracksShrinkageMinimal — no need to overfillFeaturesInterior/exterior, tough and durable, weather resistant, easy to sandHazard classificationNON-Hazardous, NON-Dangerous GoodsCombustibilityNon-combustible

Selleys Spakfilla Heavy Duty: Your Complete Application Guide Selleys Spakfilla Heavy Duty is a multi-purpose, tough and durable, light grey ready-mixed filler. It is a weather-resistant filler ideal for interior and exterior applications requiring substantial filling in mortar, wood, brick, masonry, stone, plaster, concrete, and primed metal surfaces. The water-based product has minimal shrinkage — no need to overfill. For deeper cracks, apply in 6mm layers, allowing each layer to dry before applying the next. Drying time is 2–3 hours for 2mm applications. Allow longer for thicker applications and in colder weather. Once completely set, it can be sanded to a feathered edge for a perfect finish. The 435g (385mL) tub comes with a flexible spatula for application.

Safety: This Product Is NON-Hazardous Selleys Spakfilla Heavy Duty is NON-Hazardous according to the criteria of Safe Work Australia GHS 7. It is also classified as NON-Dangerous Goods. There is no signal word and no hazard statements (H-codes) for this product. It is not classified as a skin sensitiser, not classified as an eye irritant, and not classified as corrosive or irritating to skin. However, as with any building product, sensible precautions apply. The SDS notes that contact with skin may result in irritation, the material may be an eye irritant, and dust may cause discomfort. The product may irritate mucous membranes and the respiratory tract if mishandled.

Recommended PPE Even though this product is non-hazardous, the SDS recommends: SAFETY SHOES, OVERALLS, GLOVES, SAFETY GLASSES. Gloves: Nitrile rubber gloves should be suitable for intermittent contact. Due to variations in glove construction, make a final assessment. Safety glasses: Protects against dust and potential eye irritation during sanding. Handling: Avoid eye contact and repeated or prolonged skin contact. Avoid inhalation of dust. Hygiene: Keep away from food, drink, and animal feeding stuffs. When using, do not eat, drink, or smoke. Wash hands before eating, drinking, or smoking. Ensure eyewash stations and safety showers are close to the workstation location. Engineering: Natural ventilation should be adequate under normal use conditions.

Product Overview Multi-purpose: Works across mortar, wood, brick, masonry, stone, plaster, concrete, and primed metal — the widest surface compatibility in the Selleys filler range. Tough and durable: Designed for substantial filling applications that require a robust repair. Weather resistant: The SDS describes this as a "weather resistant filler" — suitable for exterior applications when properly finished. Ready mixed, water based: No mixing required. Use straight from the tub. Minimal shrinkage — no need to overfill: Fill flush with the surrounding surface. Easy to sand: Once set, sands to a feathered edge for a perfect finish.

Prepare the Surface Surface must be clean, dry, and free of loose or any protruding material. Exterior surfaces should be primed before application. This is a specific TDS requirement for all exterior work — prime the surface before filling. This ensures proper adhesion and weather resistance.

Apply the Filler Using the flexible spatula, press the filler firmly into the surface and smooth off. The product has minimal shrinkage, so there is no need to overfill. Apply the filler flush with the surrounding surface. For deeper cracks, apply in 6mm layers allowing each layer to dry before applying the next. Do not attempt to fill deep voids in a single thick application. Build up the repair in successive 6mm layers, ensuring each layer has fully set before adding the next.

Drying Times ConditionTime2mm applications2–3 hoursThicker applicationsAllow longerColder weatherAllow longer Allow 2–3 hours to set for 2mm applications. Deeper repairs applied in 6mm layers will require 2–3 hours per layer before the next can be applied.

Sand and Finish Once completely set, Spakfilla Heavy Duty can be sanded to a feathered edge for a perfect finish. The product is easy to sand. Use fine sandpaper and blend the edges of the repair smoothly into the surrounding surface.

Paint the Repair Paint with water or oil-based paints after applying undercoat. An undercoat provides uniform adhesion and appearance before the final paint coat. Protect from rain until dry and painted over with two coats of paint. For exterior applications, the repair must be fully dried and have two coats of paint applied before exposure to rain.

Clean Up and Storage Uncured product: Use water to clean up before the filler sets. Storage: Store in a cool, dry place. Keep container closed when not in use.

Know the Limitations

Avoid using below 5°C or in wet conditions — cold and wet conditions prevent proper curing Not recommended where building movement is expected — use a flexible sealant such as Selleys No More Gaps instead Exterior surfaces must be painted to protect from rain — protect from rain until dry and painted with two coats

Tips for Best Results For deeper cracks, apply in 6mm layers. Allow each layer to fully set (2–3 hours minimum for 2mm depth) before applying the next layer. This prevents trapping moisture and ensures each layer cures properly. Prime exterior surfaces before application. The TDS specifically requires priming exterior surfaces before filling. Paint with water or oil-based paints after applying undercoat. The undercoat ensures the repair blends with the surrounding surface. Protect from rain until dry and painted with two coats. Two coats of paint are specified for rain protection on exterior repairs. Where movement occurs, use Selleys No More Gaps. This filler is not flexible — it is designed for static repairs only. Sand to a feathered edge. Once set, sand the edges of the repair to blend smoothly with the surrounding surface. No need to overfill. Minimal shrinkage means you can fill flush with the surface.

Troubleshoot Common Problems Problem: Filler not set after 2–3 hours Drying time of 2–3 hours is for 2mm applications. Thicker applications and cold weather extend drying. Wait longer and check again. Do not apply the next layer until the previous one has fully set. Problem: Filler cracks in deep repair For deeper cracks, apply in 6mm layers. Do not attempt to fill deep voids in one application. Each layer must dry before the next. Problem: Repair on exterior wall failing Exterior surfaces should be primed before application. Protect from rain until dry and painted with two coats of paint. Both priming and painting are required for exterior durability. Problem: Repair in moving joint cracks This filler is not flexible. Where building movement is expected, use Selleys No More Gaps or another flexible sealant instead. Problem: Paint not adhering over repair Apply an undercoat before the final paint coat. Ensure the filler is fully set before painting. Problem: Filler won't adhere to surface Ensure surface is clean, dry, and free of loose or protruding material. Prime exterior surfaces before filling.

Your Pre-Application Checklist PPE (recommended):

Safety shoes, overalls, gloves (nitrile rubber), safety glasses Avoid eye contact, prolonged skin contact, dust inhalation Natural ventilation adequate

Materials and conditions:

Temperature above 5°C, not wet conditions Surface is clean, dry, free of loose/protruding material Surface is compatible: mortar, wood, brick, masonry, stone, plaster, concrete, or primed metal Exterior surfaces: primed before application Not a moving joint (use No More Gaps for movement)

Application plan:

Drying time planned: 2mm = 2–3 hours; thicker = longer; cold = longer Deep repairs: 6mm layers, each fully set before next No need to overfill — minimal shrinkage Sand to feathered edge once set Paint plan: undercoat then topcoat (water or oil-based) Exterior: protect from rain until dry and painted with 2 coats

First Aid Information This product is NON-Hazardous, but the SDS provides first aid measures as good practice: If poisoning occurs, contact a doctor or Poisons Information Centre (Phone Australia 131 126, New Zealand 0800 764 766). Inhalation: Remove from exposure. Seek medical advice if effects persist. Skin contact: Flush skin and hair with running water. Seek medical assistance if swelling, redness, blistering, or irritation occurs. Eye contact: Wash out immediately with water. Seek medical advice as sensible precaution. Ingestion: Rinse mouth. Do NOT induce vomiting. Give glass of water. Seek medical advice. Notes to physician: Treat symptomatically. Emergency telephone: Australia — 1800 220 770; New Zealand — 0800 220 770.

References

Selleys Spakfilla Heavy Duty Technical Data Sheet (Version 3.0, 17/12/2020) — Description, uses, features, technical details, directions, tips, limitations, storage Spakfilla Heavy Duty Safety Data Sheet (Version 6.0, 16 March 2022, Ref: SELGHSEN000633) — Hazard identification, PPE, first aid, composition, physical properties Selleys Spakfilla Heavy Duty Product Page — Features, limitations, directions

Label Facts Summary

Disclaimer: All facts sourced from official Selleys documentation. Consult the full SDS and TDS for complete information.

Verified Label Facts

Product name: Selleys Spakfilla Heavy Duty (SDS: SPAKFILLA HEAVY DUTY) Brand: Selleys (a division of DuluxGroup (Australia) Pty Ltd) Recommended use: Weather resistant filler for plaster, timber, concrete brick & stone Description: Multi-purpose, tough and durable, light grey ready-mixed filler Technology: Water based Appearance: Smooth paste Colour: Grey (TDS) / Light grey (SDS) Odour: Mild, characteristic Specific gravity: 1.08 – 1.18 Viscosity: >5,000P Solubility: Dispersible in water Packaging: 435g (385mL) tub with flexible spatula Uses: Interior and exterior — mortar, wood, brick, masonry, stone, plaster, concrete, primed metal Features: Interior/exterior, tough and durable, weather resistant, easy to sand Drying: 2–3 hours for 2mm. Longer for thicker/colder. Layer depth: 6mm layers for deeper cracks Shrinkage: Minimal — no need to overfill Finish: Sand to feathered edge Painting: Water or oil-based paints after undercoat Rain protection: Protect until dry and painted with two coats Exterior: Prime surfaces before application Movement: Where occurs, use Selleys No More Gaps Limitation: Below 5°C or wet conditions Clean-up: Water before filler sets Storage: Cool dry place, container closed Hazard: NON-Hazardous, NON-Dangerous Goods Not a skin sensitiser, not classified eye irritant Non-combustible PPE recommended: Safety shoes, overalls, gloves (nitrile rubber), safety glasses Composition: Poly[oxy(methyl-1,2-ethanediyl)] <1% Emergency: AU 1800 220 770; NZ 0800 220 770 Poisons Info: AU 131 126; NZ 0800 764 766

Frequently Asked Questions What is the product name: Selleys Spakfilla Heavy Duty What type of product is this: Multi-purpose, tough and durable, weather-resistant ready-mixed filler What surfaces can it be used on: Mortar, wood, brick, masonry, stone, plaster, concrete, and primed metal Is it for interior or exterior: Both interior and exterior Is it weather resistant: Yes — SDS describes as weather resistant filler What colour is it: Grey (TDS) / Light grey (SDS) What size is available: 435g (385mL) tub with flexible spatula Does it need mixing: No — ready mixed, water based How long does 2mm take to dry: 2–3 hours What about thicker applications: Allow longer drying times What about cold weather: Allow longer drying times How deep can I fill in one layer: Apply in 6mm layers for deeper cracks Do I need to overfill: No — minimal shrinkage, no need to overfill Is it easy to sand: Yes — can be sanded to a feathered edge for perfect finish Do I need to prime exterior surfaces: Yes — exterior surfaces should be primed before application How do I protect exterior repairs from rain: Protect from rain until dry and painted with two coats of paint Should I use an undercoat: Yes — paint with water or oil-based paints after applying undercoat Can I use it on moving joints: No — where movement occurs, use Selleys No More Gaps What is the minimum temperature: 5°C — avoid below 5°C or wet conditions Is it hazardous: No — NON-Hazardous, NON-Dangerous Goods What PPE is recommended: Safety shoes, overalls, gloves (nitrile rubber), safety glasses What are the emergency numbers: Australia 1800 220 770; New Zealand 0800 220 770 What is the specific gravity: 1.08 – 1.18 Is it tough and durable: Yes — described as tough and durable in the TDS