PC ProductsPC-Petrifier Water-Based Wood Hardener, 16 oz, Milky White 164440

Easy to use and hardens the rotten joists up well. First I cleared any loose rotten wood. I applied the hardener with a paint brush. It was easy to use and hardens up quickly. Overall I'm very happy with my purchase.

I am repairing 125 year old rotted wood old growth fir window sills. PC Hardener soaks right into the wood and hardens in a few hours. After it drys you can tell if you missed a spot by sticking your finger nail or a screw driver in to see if in resists. Easy to apply to a horizontal surface. You need a brush for vertical surfaces where it tends to drip or narrower areas like window trim that is fluted. I bought a box of cheap chip brushes to work with the hardener. Virtually no odor! I bought the smaller size 32 oz to see how it worked and how far it would go. Photos are before and after on west and east facing windows and typical of the rotted weathered sills on my house [30" wide 6" deep] with deep cracks, some of which go almost al the way trough 2" thick wood. One 32oz container hardened four window sills and the 24oz PC Woody epoxy filler set was enough to fill those four sills. Easy to clean up spatulas and hands with denatured alcohol. Easy to sand the epoxy with 80 grit sandpaper. It feels like a great surface to paint too.

Really don’t know if it will work as stated but it’s worth a shot ! Easy to apply .Purchased this product to repair our 34 year old treated wood outside decks (3) . Generally (99%) of the decking material was solid but had grain separation. We had scheduled to have the decksk painted but elected to do this repair prior to painting to see if we can get a few more years out of them. Will sand and have the decks repainted next summer .

This worked really well to stop the rot and flacking of an old chest. It dries relatively fast and didn’t stain the finish

Works very well on water damaged plywood.

Best Wood Hardner I have used easy to put on.

Used the product on soft wood. It is a very thin liquid. I don’t think it did too much on the wood. I did two coats of it and it didn’t seem like a huge difference.

Using this to stabilize old rotted timbers on a 100-year-old Tudor-style exterior. I had been using the Bondo wood stabilizer, which is a good product but it's spirit-based and smells awful and not good to breathe.This product is water based but still manages to absorb into the wood very effectively. Dries overnight (the Bondo product is faster, a couple of hours) You can kind of squirt it on a horizontal surface and brush it in. For vertical surface, I have found that the best method is to pour a little of this stuff into a party cup and use a cheap bristle brush (1 inch artist's brush works well) and just kind of dab it into the wood.The main purpose of this product is to harden the surface of rotted wood so there's a stable base for an epoxy putty (bondo or any of the specialty play-doh type putties.) which you use to fill the holes and recreate the shape of the wood. The putty itself is rock hard so it needs something hard to hold on to, otherwise the whole thing would fall apart when you shape and sand the hardened putty.Anyway I like this and the price (while not cheap) seems reasonable. This bottle will probably handle 5 or 5 square feet of wood surface that needs to be treated.