Polycell Damp Seal – Permanently Blocks Damp Stains Before Painting Polycell Damp Seal is a high-performance, stain-blocking coating designed to seal and prevent damp patches from showing through your paint. It creates a powerful barrier over stains caused by moisture, water ingress, condensation and household leaks, ensuring your topcoat stays clean and mark-free. Ideal for use on interior walls and ceilings, this reliable damp blocker provides a quick and effective solution for decorators and homeowners dealing with persistent damp marks. Simply apply, allow to dry, and paint over for a professional, long-lasting finish. Key Features Seals and permanently blocks damp stains Prevents yellow or brown marks bleeding through paint Suitable for plaster, brick, masonry and previously painted surfaces Quick-drying formula – ready to paint over once dry Easy to apply with a brush or roller Perfect for kitchens, bathrooms, bedrooms and areas prone to moisture When to Use Covering damp patches before painting Dealing with water mark staining from leaks Blocking persistent discolouration Providing a base coat before applying emulsion How to Apply Ensure the source of damp is fixed before applying. Clean and dry the affected area. Apply one generous coat using a brush or roller. Allow to dry completely before applying your topcoat. Coverage & Drying Coverage varies depending on surface porosity. Typically 5–7m² per litre. Drying time is generally 2–4 hours. Important Note Polycell Damp Seal is a damp stain blocker – it prevents marks from bleeding through paint. The underlying cause of damp must always be resolved before decorating. Frequently Asked Questions Does Polycell Damp Seal stop damp? It blocks and seals staining caused by damp, but it does not fix the underlying cause. Always resolve the moisture source before decorating. Can I paint straight over Polycell Damp Seal? Yes. Once the coating is dry, you can paint over it with emulsion or appropriate topcoat. How long does it take to dry? Most surfaces are ready to paint in 2–4 hours depending on ventilation and temperature. Can I use it on ceilings? Absolutely. It is ideal for sealing water marks and damp stains on ceilings and high-moisture areas. Is it suitable for bathrooms? Yes, as long as the cause of moisture has been fixed. 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