I am building a new frog tank, and I decided to make the waterfall separate and removable. I built it out of some parts of plastic tubs (cool whip and lean cuisine lol) and Great Stuff, then coated it with grout. Then I painted it and covered it with fiberglass resin, to seal it. Question is, how long will it take for the resin fumes to go away? I don't want to put it in with the frog until I know it's safe. The external parts seem relatively fume-free, but the inside is very strong.

