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)

Good product but on a hot day it goes off QUICK! I used this to backfill fiberglass pool steps that were cracked. I learned on the first mix to not do a lot. The idea was to pour it into the holes I drilled into the stairs that would be patched after. Nope. I had about 3 seconds to get it into the hole as it started going off and most of it would up on the stair. I went out and got funnels for each hole, mixed for 10 seconds and removed the funnel fast. This was better.

Works

I used the 4 lb foam to make a custom dress form, it did well with a plaster cast you’ll want to paint the inside of the cast with latex paint and use mold release first. The foam is nice and dense! It sands well by hand or with an orbital sander. And it paints well too. You will NEED to use a mixing attachment for your drill!! I tried to mix by hand for a little batch and it did not foam up as much. You will also want to work within the temperature range. If you follow what it says to do it will expand 15x its size. I have bought this 3 times for 2 different custom projects and I will buy again!

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.

I used this to repair some damage to a classic 13 Boston whaler. I actually redid the floor and have a word of advice for anyone new to this type of product. Prep your area well and understand the impact ambient temperature has on this foam. While liquid and while mixing/pouring this foam sticks to everything. EVERYTHING. I use masking tape and those cheap brown rolls of contractor paper to make sure the only thing exposed to the foam before and after expansion is the hole I’m pouring into. Regarding the temperature: the hotter it is outside the faster the foam mixes and needs to be poured. Also the hotter it is outside the more your foam will expand overall. I tried filling a small hole on a 70 degree day and the foam performed well. I thought….. the next week I filled a similar sized hole and used the same amount of foam. Only difference was the temperature outside was in the 90’s. I had the foam expand at least twice as far and ooze out all over the place. Just be mindful of them temp and as expensive as this foam is I suggest doing it on the hottest days you can so that you get the most expansion.

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!

as described and pictured

Works well. Use it for my taxidermy projects

Excelente

Petrol breaks this product down and absorbs petrol

Yes, it’s expensive. But it worked great for me. Hardens in minutes, and expanded more than I thought it would. Time will tell if it was effective for my use, which was a 4” big O tube buried with my garage hydro line going from the main breaker panel in my basement. Water was getting into the line and coming into the 90 degree elbow conduit in the basement. Hopefully it sealed the big O tubing from letting water down the line.

My first use of this stuff was unconventional. I injected it into the failed diaphragm that engaged the front wheel drive of my 05 Suzuki Grand Vitara. Saved me taking the diff all out and apart. Worked great. Is real dense and firm when cured and seems unaffected by oil. My next unconventional use will be doing some shaping to the front of my Smart Car.

Works great but you have to be fast!