I hae heard of some people using vaseline to help it adhere to the back of the tank. I did try that once just to see. The problem there is that you still get air bubbles that show and hn the edges start to dry out ater a while once again leading to the same change of color. Not really sure what the answer is. I do know that once he tank is in place, it is usually to near the wall to do much changing at that point.