The Thompson’s Stain Block Damp Seal 2.5L is a high-performance interior sealant designed to tackle damp stains and moisture issues on walls and ceilings. Its advanced formula allows moisture to escape while effectively sealing and covering stains, creating a durable, overpaintable surface in just 4 hours. Ideal for use in homes, offices, and commercial spaces, this product provides a reliable solution for combating unsightly damp marks and ensuring a clean, fresh finish.

Whether you’re dealing with water stains, nicotine marks, or general damp spots, Thompson’s Stain Block Damp Seal provides a fast-drying, long-lasting barrier for superior protection and a professional-quality result.

Product Specifications

• Volume: 2.5L

• Boxed Weight: 3.3kg

• Finish: Matt white (overpaintable)

• Application Method: Brush or roller

• Drying Time: Touch dry in 2 hours, overpaintable in 4 hours

• Coverage: Up to 5m per litre (depending on surface porosity)

• Suitable Surfaces: Interior walls and ceilings

• Formulation: Breathable, moisture-permeable technology

Key Features & Benefits

• Seals and Covers Stains Effectively blocks water stains, nicotine marks, and other discolorations to create a smooth, paint-ready surface.

• Apply Directly to Damp Surfaces No need to wait for walls to completely dry, making it ideal for tackling damp issues quickly and efficiently.

• Breathable, Moisture-Permeable Formula Allows trapped moisture to gradually escape, preventing further issues and ensuring long-term results.

• Fast-Drying & Overpaintable Ready for overcoating with emulsion or oil-based paints after just 4 hours, enabling faster project completion.

• Suitable for Interior Walls & Ceilings Designed for use on plaster, brick, concrete, and previously painted surfaces, providing versatile application.

• Durable & Long-Lasting Protection Forms a strong, resilient seal that helps prevent recurring damp stains.

Application Instructions

1. Surface Preparation:

   • Ensure the surface is clean, free from loose material, and structurally sound.

   • If mould is present, treat with an anti-mould solution before application.

   • Remove any wallpaper or flaking paint.

2. Application:

   • Stir well before use.

   • Apply using a brush or roller in even, smooth strokes.

   • For severe stains, a second coat may be required after 4 hours.

3. Drying Time:

   • Touch dry in 2 hours.

   • Ready for overpainting in 4 hours.

4. Finishing:

   • Once dry, apply any emulsion or oil-based topcoat for a seamless finish.

Care & Maintenance

• Storage: Keep container sealed and store in a cool, dry place away from direct sunlight.

• Cleaning: Wash brushes and rollers with warm soapy water immediately after use.

• Safety: Ensure adequate ventilation when applying, and avoid contact with eyes and skin.

FAQs

Q: Can this be used on exterior walls?
A: No, this product is specifically formulated for interior walls and ceilings. For exterior damp protection, consider a dedicated masonry waterproofer.

Q: Does it stop damp completely?
A: This product seals stains and allows moisture to escape, but it does not eliminate underlying damp problemscaused by leaks or structural issues. It is recommended to identify and fix the source of damp before application.

Q: Can it be used on wallpaper?
A: No, wallpaper should be removed before application to ensure proper adhesion to the wall surface.

Q: What type of paint can be applied over it?
A: It is compatible with all standard emulsion and oil-based paints once fully dry.

Conclusion

The Thompson’s Stain Block Damp Seal 2.5L is a powerful and reliable solution for sealing and covering damp stains on interior walls and ceilings. With its fast-drying formula, breathable moisture technology, and ease of application, this product ensures a professional finish while allowing moisture to escape safely.

Whether tackling damp-prone areas, water stains, or nicotine marks, this overpaintable sealant provides long-lasting protection and a pristine surface ready for decoration.

A must-have for DIY enthusiasts and professionals seeking efficient and effective damp stain coverage.