Fiberglass Supply Depot 4 Lb. Density Expanding Pour Foam, 2 Part Polyurethane Closed Cell Liquid Foam for Boat and Dock Flotation, Soundproofing, Filling Voids, and Insulation (1 Gallon Kit)

Works well. Be quick and ready for it, it expands quickly and will come for you if you're not prepared to control it.

Works great , quick set up and easy to use

Being a more dense foam I was hoping for more expansion but it did the job. I used this to repair my pool steps from where improper install caused the dirt to wash out underneath them. This filled the void well.

It arrived broken, but they replaced it. I give it 5 stars because the product is super good for my boat; it's excellent. Thank you.

I called late on a Friday afternoon to ask a quick question about the prep work and cleanup supplies i should have ready before i mixed it, and actually talked to a REAL person! Super helpful, down to earth, and friendly. If you are using this foam on a project for your self (outside of a commercial application), trust me that the guys who manufacture and answer the phone are just like you [us] doing the same silly weekend projects that our wife's yell at us for. Great manufacture, with excellent customer service!

Just follow the instructions and the product will do its job. It gives you just enough time to mix and pour to finish your project and sets up solid enough to stand on within 10 minutes. Can easily withstand the weight of a person bouncing up and down on it. Just wish that it would expand a little bit more, having to buy a few more jugs to finish my boat project. Definitely gets pricy.

I am used to working with 3lb foam and wanted to try a 4lb foam for a project that needed some extra stiffness. This product didn't disappoint. The volume of foam that it made wasn't as much as a lighter density, but it set off and hardened extremely quickly. I was able to do my project quickly and get it out of the way. Thanks for making it easy.

This product was worthless. Way too expensive, didn't foam up. For $76.00 this was a joke. Just use spray expanding foam. Way cheaper and expands more