Ronseal One Coat Damp Seal White 250ml - Permanent Stain Block

Ronseal One Coat Damp Seal White 250ml - Permanent Stain Block Description

Ronseal One Coat Damp Seal White (250ml) – Ultimate Breathable Stain Blocker

Stop damp stains in their tracks with the UK’s most trusted moisture-barrier technology. Ronseal One Coat Damp Seal is the definitive 2026 professional-grade solution for permanently neutralizing unsightly damp patches, watermarks, and salt staining on interior walls and ceilings. Engineered with Vapour-Permeability Technology, this high-performance primer doesn't just hide the problem—it allows the substrate to breathe, preventing the trapped-moisture cycle that causes standard paints to flake and peel.

(How to Use)

1. DIAGNOSIS & PREP

Crucial: Ensure the source of the damp (e.g., a leaking pipe or blocked gutter) has been professionally repaired before application.

• Strip any existing wallpaper using a scraper.

• Sand away loose, flaking, or "blown" paint to reveal a stable surface.

• Mould Treatment: If spores are present, treat the area with a specialist 3-in-1 Mould Killer first. The surface can be damp for application, but must not be "dripping wet."

2. APPLICATION

• Stir the paint thoroughly to activate the blocking resins.

• Apply using a high-quality synthetic brush or medium-pile roller.

• The "Overlap" Rule: To ensure a seamless seal, extend the paint at least 30cm (12 inches) beyond the visible edges of the damp patch.

3. CURING & FINISHING

• Allow 2 hours to become touch-dry.

• Wait 4 hours before applying your final emulsion or hanging wallpaper.

• For areas prone to high humidity (bathrooms/kitchens), we recommend finishing with Ronseal 6-Year Anti-Mould Paint.