Masseys DIY Store

Ronseal One Coat Damp Seal

RRP £8.99£36.99

SKU: Ronseal Damp Categories: ,

Ronseal One Coat Damp Seal

Ronseal One Coat Damp Seal – Brushes straight onto damp patches and permanently covers damp stains to stop them from ruining your paint. Ready to paint over in only four hours and also available as a Quick Dry Aerosol.
  • Protects your paintwork
  • Ready to paint over in four hours so you can do all your DIY in one day
  • No need for preparation, it can be painted straight onto the wall
  • Permanently blocks and seals damp stains

How to use One Coat Damp Seal

Before you start

Before you cover up the damp, you should always make sure that the cause of the damp has been fixed. Covering it up won’t address the root problem!


  1. Open your doors and windows for added ventilation and put down dustsheets to protect anything you don’t want to get paint on.
  2. Remove any wallpaper with a scraper or, if the wall is painted, sand off any loose or flaking paint.
  3. If there is mould, tackle it with mould killer otherwise, use a cloth and white spirit to wipe down and clean the wall.

You can apply the seal directly onto a damp surface, so long as it’s not dripping wet.


  1. Thoroughly stir the paint to ensure it’s well mixed.
  2. Use a roller or brush to apply it to the affected area. If it’s only a small damp patch, paint at least 30cm around the area so the damp won’t creep elsewhere.
  3. The seal will be touch dry in only two hours. After four hours you will be able to paint or wallpaper over the damp area.


Our One Coat Damp Seal isn’t designed to be a top coat of paint so you will need to cover over it with paint or wallpaper.


Brushes or rollers can be cleaned with white spirit

Technical specification

Usage: All interior walls and ceilings
Coverage: 250ml – This tin will cover 1.25m2

750ml – This tin will cover 3.75m2

2.5L – This tin will cover 12.5m2

Dry time: Touch dry in 1-2 hours, paint over in 4 hours
Number of coats: One
Colours: White
Finish: Matt
Application: Brush or roller
Sizes: 250ml, 750ml, 2.5L
VOC: High
Weight 1 kg

White 250ml, White 750ml, White 2.5L

Ronseal Damp Seal Ronseal One Coat Damp Seal
RRP £8.99£36.99Select options