2lb Density Expanding Cast Foam, 2-Piece Polyurethane Closed Cell Liquid Foam for Boat and Dock Flotation, Sound Insulation, Filling Gaps and Insulation (1 Gallon Kit)

I wanted to try this foam for setting fence posts instead of buying the stuff at the home improvement stores. Compared to the Home Improvement store post foam this foam is a little lighter weight and not as hard but still seems to do the job and it is, or was, quite a bit cheaper than the store foam. I don’t know if I would recommend it for building a deck but a residential fence would be fine. Mixing is easy enough, I got a couple silicone measuring/mixing cups and a silicone stirring sticks so I could reuse them once the foam hardened.

Easy to pour

Magnificent. I had a sewer vent inside of a wall cavity that was leaking sewer gas inside the concrete slab. Faced with $5000 of work, I instead mixed a cup of each of these and poured it into the cavity. The closed-cell foam blocks sewer gas better than concrete. It worked beautifully! The next day, I decided to fix my tippy mailbox. Instead of mixing a bunch of concrete, I poured in a half-cup of this. Job done. The only thing unclear is that you have to add B to A, not the other way around. (Or maybe it is the other way around. Read the instructions.) The only thing that's annoying is that A and B have different densities so I have to mix it by volume, not weight. I'm probably too careful with that.

Je cherchais à savoir la différence entre la mousse de coulée extensible de 0,9 kg et celle de 1.8 kg. Je vous dit qu'elle est la différence, celle de 0,9 kg est beaucoup plus expansible que celle de 1.8 kg, par conte celle de 1.8 kg est plus solide que celle de 0,9 kg, elle est là la différence cela dépend de ce que vous cherchez. Pour moi les deux sont excellente. C'est vraiment comme les vidéo.

This product is a mess to use, but I expected that. It "goes off" pretty darn quick too, but I expected that as well. Very good product. If I'm filling a large void, I just throw the whole mixing container into the void and the foam expands all around it. Puts off a huge amount of heat, so keep that in mind. After about 10-15 minutes this stuff is hard. Expands to something like 20 times the original liquid volume. Be careful not to trap the expanding foam, because this stuff will expand regardless of the size of the void it's filling. If the void is too small, the foam expands until the void blows apart. Fun for science projects if you have kids to impress.