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Ronseal Wet Rot Wood Hardener 500ml

4.7 (421 reviews)
SKU: 240303164110013 EAN: 5010214538713

Compare 5 prices for Ronseal Wet Rot Wood Hardener 500ml — from £13.50 to £19.95 across 5 UK sellers including B & Q, Screwfix, BP Tools UK and more. Save up to £6.45 (32%).

£13.50 10h ago
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Compare Prices from 5 Sellers

Prices updated 19 Apr 2026
2
Screwfix
£14.49 +£0.99
6h
3
BP Tools UK
£15.19 +£1.69
0h
4
Tooled Up
£19.95 +£6.45
0h
5
My Tool Shed
£19.95 +£6.45
0h
#2 Screwfix
6h ago
£14.49 +£0.99
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#3 BP Tools UK
0h ago
£15.19 +£1.69
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#4 Tooled Up
0h ago
£19.95 +£6.45
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#5 My Tool Shed
0h ago
£19.95 +£6.45
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This no fuss wet rot wood hardener from Ronseal gives interior and exterior wood a new lease of life. Harden wet wood and stop nasty rot from spreading, whether it''s your garden furniture or a water damaged window frame. The fluid seeps deep into the wood and sets rock hard, which reinforces decaying parts and provides a solid base for filling.\nThe hardener dries quickly with a clear finish, and the lid doubles up as a container too, so everything you need is right here. A little goes a long way and one tin should see you through plenty of jobs around the house.\n• High performance wet rot wood hardener\n• Hardens decaying wood for a solid base when wood filling\n• Penetrates deep\n• Interior and exterior use\n• Only one coat required\n• Quick drying - dries in 2 hours\n• Sets rock hard with a clear finish\n• 500ml
Brand Ronseal
MPN RSLWRWH500
No features listed
No items listed

Customer Reviews 421

4.7
421 reviews
5 star
335
4 star
63
3 star
11
2 star
4
1 star
8
Orchard close
5.0
February 28, 2026
D N Plumbing Verified Purchase

Great product does what it says on the tin, odour free and easy to apply.

Wood treatment
5.0
February 27, 2026
JfK Verified Purchase

Easy to apply treatment that sets hard and repairs soft wood ready for filling and painting.

Does what it says on the tin
5.0
February 18, 2026
T2672 Verified Purchase

Works well, useful for solidifying crumbling and rotted timber

Easy use, low residue
4.0
January 29, 2026
Tomaso Verified Purchase

It required several applications but left little residue and no odour once the acetone solvent had evaporated.
The acetone of course had a go at anything else that was soluble in it - CA glue, hot melt glue.
Once it had finished saturating the rotten wood it did leave a surface film which is shiny.

Effective wood hardener
5.0
January 22, 2026
Derek Rose Verified Purchase

Used to protect some rotten exterior timber. Even in the cold and damp weather the hardener worked very effectively and cured hard in less than an hour.

Easy to use and clear instructions.
5.0
January 6, 2026
TheNoblest Verified Purchase

Good price and worked perfectly for restoring some wood skirting that had been damaged from getting too damp.

First option to treat soft or rotten wood.
5.0
December 22, 2025
Nimrod01 Verified Purchase

It’s the ideal solution when areas of softening or rotting wood is discovered where the rot is not too extensive nor likely not to compromise the structural integrity of timber.

Brilliant does exactly what it says
5.0
December 21, 2025
Kash6367 Verified Purchase

Great product toughened the wood enabling the work to be carried donecwithout additional costly expense

Stop the rot
5.0
November 19, 2025
Old Ken Trode Verified Purchase

Used to harden a section of wooden window beading that had rot before filling. Gave a good solid base for filler to adhere to.

Would use this product again
5.0
November 11, 2025
Handyman3 Verified Purchase

Had a problem with wet rot on window sills. Cut out the rotten sections and coated the area with Ronseal Wet Rot Wood Hardener, and once dry filler the area with a section of wood and smoothed the edges with filler. Great product.

great stuff
5.0
November 2, 2025
N Coe Verified Purchase

Great product and instock same day as required for job

Good stuff but difficult to apply
3.0
October 24, 2025
Bristol medical pro Verified Purchase

The problem is not with the efficacy of the resin solution itself but with its application. Applying a solvent with the viscosity of water to the bottom of door frames is straightforward, but rotting wood, in my experience, usually affects rafters and casings that are above where the handle of a brush can be positioned. So the stuff has a high chance not only of ruining brushes, as it immediately soaks deep into the ferrule, but a significant portion follows gravity onto your cuffs and down your arm.
Normally, I'd transfer low viscosity solutions like dilute PVA or stabiliser solutions into a washed out kitchen cleaner spray bottle or something similar, but with a solvent like this, only HDPE (high-density polyethylene) or polypropylene will do, and such spray bottles have to be purchased separately.
Bottom line is that this stuff, particularly as it need to be applied repeatedly to soak into the rotted area should be sold with a bespoke solvent-resistant spray nozzle.

Wood hardener
4.0
October 20, 2025
Marauder Verified Purchase

Treated rotten section of wood with 2 coats applied by brush. Drilled small holes to allow better penetration. Felt solid after treatment a dapplied woodfiller for additional support

Works great, no staining of material
4.0
October 16, 2025
A_Frugal_DIYer Verified Purchase

Does what it says on the tin. No staining of surrounding area.

Easy to apply
4.0
October 12, 2025
9e85f200-249d-59ac-bf86-e9f8d3416270 Verified Purchase

Used this a few times, goes on easy and soaks in well. Not sure how mush is actual hardener and how much evaporates - much like very runny superglue

Reliable product
5.0
October 5, 2025
Ian Ford Verified Purchase

Used this before , so can recommend it. Not cheap but it is a quality product

Easy On Purchasing
5.0
September 30, 2025
Patrick Sheffield Verified Purchase

Quick and Easy Purchasing Process Via Click and Collect

Great product, very effective
5.0
September 11, 2025
c64e48e9-fa70-5b9d-af34-66837b22d5db Verified Purchase

Easy to use, and hardened the soft wood left after scraping out the worst of the rotten area in a large fence post. Has very high VOCs, which I am allergic to, but my non-diy husband applied it perfectly!

Worked well
4.0
September 4, 2025
Eko Verified Purchase

Works well - used on rotten window before filing with Toupret wood filler.

Makes your wood Hard!!
5.0
September 2, 2025
MaxT3000 Verified Purchase

Works really well, better than i expected, i well definitely use again

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