hey guys I bought some decals on Ebay for my old bike. Nothing fancy just some skulls with flames. I put two on my fuel tank and they looked good. Then after the bike being in the sun all day they look like shit. All bubbly looking and just crap. I'm guessing they are just made from the wrong material. What do I need to look at as far as decal material and what do you do to make good contact to plastic?