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)

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.

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.

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

Excellent

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

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.

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

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

Works great but you have to be fast!

Very good product, came leaking tho, but was refunded.