High Performance Wet Rot Wood Hardener
How will this colour look?
This colour finish isn't available to buy here. You can purchase it through one of our approved retailers.
Description
Stop wet rot spreading and make your wood hard again so it can be easily repaired. Suitable for doors, windows and frames. Can be used inside or outside.
Product features
- Don’t replace rotten wood, repair it
- Dries in two hours
- Sets rock hard
- Soaks in deep and strengthens rotten wood
- Provides a strong base to begin filling cracks and holes
How do the colours look?
Use on...
- Wear protective gloves and eye protection. The hardener is highly flammable, so keep it away from flames, sparks and heaters, and open doors and windows for ventilation.
- Find the full extent of the rot by pushing a screwdriver or bradawl into the wood. Rotten wood will feel soft and spongy.
- Cut or scrape away any loose, crumbling wood until you reach a fairly sound base.
- Strip any paint or varnish from the repair area around it, so the hardener can soak in.
- Make sure the wood is dry. Hardener won’t penetrate wet timber properly.
- For deeper repairs, drill small holes into the soft wood so the hardener can reach further in.
- Give the tin a thorough shake.
- Pour some of the hardener out into the plastic lid.
- Brush it on generously. Keep applying until the rotten wood stops absorbing it, and fill any drilled holes.
- Leave it to dry for two hours.
- Scrub with a wire brush to get rid of any excess hardener.
- Fill holes and cracks with Ronseal High Performance Wood Filler.
- Once the filler has set, sand smooth and paint or stain as normal.
- Clean your tools with white spirit straight away.
- Don’t pour leftover hardener down drains or into watercourses.
Yes. If you've got rotten wood, just scrape out the really rotten bits. Then use our Wet Rot Wood Hardener. Once this has made your wood hard again it's ready for fixing with our High Performance Wood Filler.




