Google it. It's spray paint for plastic. I've never used it for aquarium use but have used it for projects @ work (zoo). I wouldn't recommend it for anything going into your tank. If your painting the back of your tank, another option is coated aquarium backing that's available @ any LFS. You don't have to razor blade it off when you tire of it or if it chips off. Hope that helps. :bounce:Idk, whatever krylon fusion is. I've never heard of it, nor have I used it. Hass anyone here used it?