We have two of these Yamahas. One is an 86 and the other an 85. The fuel tanks have turned yellow over the years from the gas. The tanks look like Hell and the bikes are too nice to not try and correct them. I removed the tank from my 86. I sanded it all down and it came out good. Well, except for the factory OEM decals on the tank. I simply could not get them off 100%. It's like the decals chemically embedded themselves into the plastic itself. I removed as much of the decals as I could. Between dry and wet sanding, the paint should cover them up. I'm not very good with a rattle can of paint. Almost anyone could do a better job than I could. That being the case, I went ahead and took it on. I bought some Krylon paint specially formulated for plastic and such. I put three coats on and then wet-sanded. I plan to put about 2-3 more coats on, followed by some clear coat. Once done, I'll post up a pic or two of the painted tank. This is the 1st time I've painted a plastic fuel tank. The tank itself is quite rigid and non-flexible. I'm hoping the paint adheres well.