I quite putting decals on planes, since most do what you are experiencing after long exposure to fuel. I really got agravated at Hangar Nine for already installing them on my new funtana 90. I'd rather make my own stuff with monocote or ultracote, or get good vinyl graphics. The way you put them on works for most of us, so you don't get bubbles, if you tried to stick them on dry. Some folks even spray the edges with clear epoxy, but you really start putting additional unnecessary weight on the plane. I don't know about you, but I have my planes to fly and enjoy. They fly much better when they weigh less. that particular airplane you have is a great low wing trainer, and when balanced right flat spins like crazy. I have a WM Fun World 3D 120 with a ST G2300 on it. Really flies great and is very light for it's size. Good luck with your mentor.