I am sorry if this has been talked about, but I could not find it in the archives/forums. I am working on truck stop, and the artwork stickers that are on the plastic ramp are bubbled up in several spots. I am trying to figure out how to get them smooth again or worse case, what is the best method for recreating them? I have found clear sticker "paper" that you can print onto and it has a sticky back. That is the best option I have come up with thus far. There is one decal that almost certainly needs replaced because at some point in its life someone spilled either an epoxy or glue on the image when they tried to reattach a metal rail with glue instead of rivets. Thank you for any guidance!

Thank you for the help. This may be a silly question but with the example in the link and in the other link provided by terryb, the decals are actually attached on the underside of the ramp. Truck stop's ramps are not clear so the decals are actually on the playing surface side of the ramp. Is this method still okay for those type of decals? Thanks again.