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Preparation & Fillers

Discover our range of preparation and fillers from Toupret, Ronseal, Faithfull and Roughneck, covering interior and exterior wall fillers, skimcoat products, wood fillers and hardeners, and the tools needed to apply and finish them.

Good preparation determines how well a paint or coating finish looks and lasts, and choosing the right filler for the job, interior or exterior, fine surface or structural repair, makes the difference between a smooth, lasting finish and one that cracks or shows through.

Toupret Rock Solid Repair Filler 10kg – – Now available at MTN Shop UK.

Interior wall fillers

Toupret's range covers most interior wall repair needs: the Quick Dry Filler speeds up repairs where you can't wait for a standard filler to cure, the Fine Surface Filler gives a smooth finish for the final skim before painting, and the Renovation Skimcoat resurfaces larger damaged areas. The Ready To Use Joint & Skim and Joint Skim & Fill handle plasterboard joints specifically, while Fill-Flex gives a flexible filler for joints prone to movement, such as where different materials meet.

Exterior and masonry fillers

For outdoor repairs, Toupret's Exterior Skimcoat Filler and Exterior Masonry Repair Filler are formulated to withstand weather exposure that an interior filler isn't built for. The Rock Solid Repair Filler steps up to heavier structural repairs where standard filler wouldn't hold.

Crack and hairline repair

Ronseal's Smooth Finish Hairline Crack Filler is purpose-built for fine surface cracks that a standard general-purpose filler would leave visible or take too much material to fill properly.

Wood filler and hardener

The Ronseal High-Performance Wood Filler Hardener/Catalyst speeds curing for repairs on wood that needs to be back in use quickly, while Wet Rot Wood Hardener stabilises softened, rot-affected timber before filling, giving the filler something solid to bond to rather than applying it over compromised wood.

Silicone removal and sealant application

Before resealing a joint, old silicone needs to come out cleanly. The Faithfull Silicone Removal Knife and Silicone Scraper Kit strip out old sealant without damaging the surrounding surface. For applying new sealant, the Roughneck Vari-Flow Heavy-Duty Sealant Gun gives controlled, even application.

Expanding foam application

The Roughneck Professional Foam Gun Deluxe gives more precise control over expanding foam than using the can's own nozzle directly, useful for gap filling and insulation work where accuracy matters.

Choosing the right filler

Match the filler to both the location (interior or exterior) and the scale of repair. Fine surface fillers suit small cosmetic imperfections before painting, while skimcoat and structural fillers handle larger areas or more significant damage. Exterior fillers are formulated to withstand weather exposure that interior-only products aren't rated for, so don't substitute one for the other.

Why buy your preparation and fillers from MTN Shop

All preparation and filler products sold here are genuine stock from Toupret, Ronseal, Faithfull and Roughneck. We ship fast across the UK with straightforward returns on unused stock. For trade or bulk orders, request a quote and our team will confirm stock and lead time directly. For any other questions, contact us and our team will be happy to help.

Frequently Asked Questions

A fine surface filler is designed for small cosmetic imperfections and a smooth final finish before painting. A skimcoat filler resurfaces larger areas of damage or an entire wall section, giving a level base to work from.
No, exterior fillers are formulated to withstand weather exposure, moisture and temperature changes that interior-only fillers aren't rated for. Using an interior filler outdoors risks it failing, cracking or washing out over time.
If the wood is softened or affected by rot, a hardener stabilises the timber first, giving the filler something solid to bond to. Filling directly over compromised wood without hardening it first often leads to the repair failing.
A dedicated silicone removal knife or scraper strips out the old sealant cleanly without damaging the surrounding tile, tub or surface, giving a clean joint for the new sealant to bond to properly.
Fill-Flex is a flexible filler designed for joints prone to movement, such as where different materials meet or expand and contract at different rates. Standard rigid filler can crack in these joints over time, while a flexible filler moves with the joint.

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