Fishtanks | use of polyurethane waterproof foam for sculpting
The great stuff cave project part Deux ummmmm I mean 2 - YouTube | Expanding foam, Diy sprays, Spray foam
Tried out a weird idea I had with my old tank, it's a cave made with spray- foam and lava rock. On top is a bunch of moss I literally just scrapped off
Aquascaping with Insulation Foam by Eric Meier - Reefkeeping.com