Rapide Spray & Seal Mastic Sealant 400ml – Flexible Waterproof Leak Repair Coating

Stop leaks instantly with the Rapide Spray & Seal Mastic Sealant collection. This professional-grade rubberized aerosol creates an immediate watertight barrier, making it the ultimate emergency repair solution for roofs, gutters, downpipes, window frames, flashing, sheds, caravans, and PVC pipework.

Formulated with an advanced, high-elasticity rubberized resin, it penetrates deeply into cracks and fissures to seal out moisture instantly. The high-flexibility formula expands and contracts naturally with seasonal temperature shifts, guaranteeing zero cracking, peeling, or flaking. It cures rapidly into a tough, sag-free, and fully paintable waterproof membrane that blocks rust, corrosion, and UV degradation.

Technical Specifications:

• Volume: 400ml High-Capacity Aerosol Can

• Chemistry: Advanced high-elasticity rubberized mastic resin

• Substrates: PVC, Metal, Steel, Aluminium, Roof Tiles, Brick, Concrete, and Wood

• Performance: 100% Waterproof, crack-resistant, thermal expansion barrier

• Rating: Weatherproof, UV-stable, anti-corrosive, and paintable (Interior/Exterior)

• Application: Pressurized aerosol—no mixing or caulking guns required

Ordering Information: This is a multi-variation listing. Please use the drop-down menu at the top of the page to select your required sealant colour variation before checking out:

• Rapide Spray & Seal Black (400ml) – Ideal for roof flashing, dark guttering, downpipes, and automotive underbodies.

• Rapide Spray & Seal White (400ml) – Perfect for white PVC window frames, conservatories, and caravan profiles.

All items are brand new, safety-sealed, and dispatched rapidly from UK stock.