I bought some regular spray paint from my local home improvement store, which costs less than $1. I used to use those aquarium backings, but never ever changed them at all. The only time I really would is if I took down the hole tank. Now since I spray paint the tanks, the spray paint held on well and can easily be removed by scraping it off. I used a razor once to remove it and it wasn't that difficult. If you use something that flakes off too easy, then it will probably come off if something rubs on it.