So I must have three large UTHs that I must have forgotten to cover with wax paper after removed from their cages. I found them in a box from moving, and they all work fine, but won't stick. I bought a spray adhesive, but every time I plug them in, the heat removes them from the glass. Any ideas on how to get them to stay? I'd like to use them, in this 40 gal breeder I have. I've already made the plexi lid to hold humidity, and blacked out three sides, so heat is all I have left. If all else fails, I'll just quit being lazy and buy a new one....