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)

Excellent

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.

It's it reacts very fast, especially when it's hot out. But it is very solid, takes about 10 minutes to set up completely. It works perfect for fence posts.

Product works great. It takes some trial and error to judge the right amount to mix because it really expands. It’s easy to cut away any excess

It seriously sets way faster than expected, you get about 30 seconds of working time. I definitely don’t recommend mixing a full gallon at a time. But, it got the job done, my concrete slab is now level!

Order more then yup think you need

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.

Would NOT buy this again ! The expansion rate is a joke for this kit. You are better of buying True Composites 1/2 gallon kit, it expanded more for the 1/2 the price of this kit. Buyer beware.

Awesome stuff, I used it to fill holes used from animals going under my cement driveway and walkway. Fantastic results and hardens like a rock

Petrol breaks this product down and absorbs petrol

It worked perfectly to replace floatation foam in a boat

Everything you always wanted in a pourable expanding foam, pricey, but works well.

Works great but you have to be fast!