Polymer Planet Liquid Urethane - 2-Part Closed Cell Rigid Pour Foam - 4 Lb Density - Fast-Acting Formula - Great for Boat Buoyancy, Flotation, Filling, Soundproofing, Insulation - 2 Gallon Kit Total

Really great product. It was pretty accurate as far as the yield. The 2 gallon kit wasn't enough for my first round, but ordering another 2 gal kit will fill the entire floor under the bow cabin on a 21 ft sailboat. 4 cubic feet at over 80 degrees, low humidity. Mixing can get messy, but small batches of 300ml was about perfect to mix small batches and build layers until the cavity was full with great results. Follow the directions and it's great.

I refurbished a 1975 fiberglass fishing vote and had to remove all of the old foam under the floorboard. After watching youtube videos on how to install, I used the "drill a hole in my brand new floor and pour it it" method. This product worked very well. It expands very fast once mixed so you have to plan for that.... This kit expanded and covered an area about 4 feet wide by at least 7 feet long. The area is also about 3 or 4 inches thick. New wood bracing took up some of the space too. I would use again in a heartbeat. My boat is 16 feet long with a step up in the front. I did not have enough to put foam in the front of the boat. Use protective gloves. It's very messy.

I used this under a new deck I put in an older boat. It did what it said it would do. It appears strong yet easy to work with. Priced well.

As a small business owner, I used this product in quart size several times a week to encapsulate my electronics. The stuff worked excellent until the last drop, so I stepped up to the gallon size. The first batch basically no reaction (as seen in the photo). I ordered a replacement gallon set and it had the exact same problem. I don't know if this stuff sat on the shelf too long, got exposed to abnormal temperature, improperly mixed at the factory or what but I need to move on to a different brand. There is also no lot code or date of manufacture on the bottles so quality control is suspect. In the HDPE mold, you can see the bad version vs the old good version above slightly out of focus.