Ive done three tanks with Great Stuff, and i havent had any of the problems mentioned except warping. The first one i did was with a cardboard template and it warped, then i used a stronger cardboard and let the GS cure for 48-72hrs and it didnt warp. Also, you can definitely silicone it down. Thats how all of mine have been held in place. Just use alot of silicone and make sure to "set" it first by siliconing it into place, then removing it to allow the silicone to set a little on both the tank and the rock. Let it set for 15 minutes or so then place it back where you had it. Weigh it down for 24hrs while the silicone is curing and youll be good to go. When fully cured GS will be as structurally sound as a closed cell styrofoam. The stuff gets pretty hard.
BTW-Check out my thread on the Paludarium i built for my Whites Tree Frog. Thats a mix of closed cell styro and GS and i havent had any of the problems mentioned above with it.
BTW-Check out my thread on the Paludarium i built for my Whites Tree Frog. Thats a mix of closed cell styro and GS and i havent had any of the problems mentioned above with it.
