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Ronseal High performance Clear Hardener, 500ml

Sold & shipped by B&Q
£13.50£27 per l
Under 18 years

Product details

Product information

Ronseal Wet Rot Wood Harder Reinforces decayed wood. Creating a solid base for filling.

  • Guarantee - Statutory
  • Suitable for Decayed wood
  • Wear protective gloves to avoid getting hardener on your skin. Open your doors and windows for added ventilation. Remove loose or crumbling wood and make sure the area is dry. For the best repairs, drill small holes into the wood so hardener can get in deeper.
  • Give the tin a thorough shake. Pour some of the hardener out into the plastic lid. Apply it with a paint brush. Make sure you get enough on so that it completely soaks into the rotten wood. Leave it to dry for two hours. Scrub with a wire brush to get rid of any excess hardener. Clean your tools with white spirit.
  • Instructions for Use - Give the tin a thorough shake. Pour some of the hardener out into the plastic lid. Apply it with a paint brush. Make sure you get enough on so that it completely soaks into the rotten wood. Leave it to dry for two hours. Scrub with a wire brush to get rid of any excess hardener. Clean your tools with white spirit.

Features and benefits

  • Dry in just 2 hours for quicker repairs
  • Sets rock hard
  • Repairs rotten wood, creating a solid base
  • Soaks in deep and strengthens rotten wood
  • Provides a strong base to begin filling cracks and holes

Health and safety

Please note that this item has additional safety or regulatory datasheets available. The product may have possible health and safety hazards covered in these documents. Refer to the container for full information and always follow the instructions.

Specifications

BrandRonseal
ColourClear
LocationInterior & exterior
Volume500ml
Application methodBrush
Number of coats1
Container typeTin
BaseSolvent-based
VOC levelVery high
DurabilityHeavy duty
WashableWipeable
Product code5010214538713
Safety Information
Manufacturer / EU responsible person
Reviews
4.57 / 5(70 reviews)

Stevo1966 - 5 / 5 - 17/06/2025

Does exactly what it says on the tin

Did the job I needed it to do. Product is a godsend

Nectar - 5 / 5 - 16/06/2025

Great stuff for rotting wood

Super stuff, used to restore a rotting shed base. Got through a couple of bottles but the wood is now rock solid.

GM1875 - 5 / 5 - 15/06/2025

Lives Up to Its Name

This hardener worked exactly as promised. It cured quickly and bonded extremely well when used with the wood filler. It gave the repair a solid, durable finish that felt much stronger. Ideal for tougher jobs where lasting strength is important. Very impressed with the performance.

Hilary 333 - 5 / 5 - 07/06/2025

Great product

I used this on parts of a shed that were starting to rot. I then filled with Ronseal wood filler and the shed is good as new. The hardener gets sticky so rinse out promptly with white spirit.

Loube - 5 / 5 - 04/06/2025

All good

Seems pretty good. Dried to slight sheen. Dried pretty quickly.

Chief1 - 5 / 5 - 29/05/2025

Good wood hardner

Bought for wood rot Garage door has hardened up wood as required

Amateurtablefixer - 5 / 5 - 24/05/2025

Saved a garden table from the tip

Excellent for stabilising soft or rotting areas on aged wood. It soaked in well and gave my 11-year-old garden table a much firmer feel, especially around flaky edges. Dries clear and quickly, giving a solid base for sanding and staining. A must-have for prepping older outdoor furniture before refinishing. A little goes a long way, and don't forget to clean brushes with hite spirit after.

RS654 - 5 / 5 - 19/05/2025

Did the trick

Hardened the wood enough for me to clear out the rotten bits and fill in, to prolong the life of the window frame. It was quick and easy to use and will hopefully enable me to put off the replacement window for a few years 🤞🏻

Spiderlish - 5 / 5 - 09/05/2025

Does exactly what it says on the tin

No joke - cracking stuff. I restored five wooden window sills with this. Really happy.

Ste2025 - 5 / 5 - 04/05/2025

Cleaner product

This cleaner really did the trick. It set really quick and hard and should prevent further cracking.