.Help!Orange door panel resto

You're correct on the lacquer thinner, BUT it's a very tricky process......

You have to use a LITTLE at a time, being sure never to "saturate" the surface with thinner......and be careful about the amount of pressure applied......treat the vinyl like it was your own SKIN...........

Try a test area first is my recommendation..........Down on the bottom of a panel, like the rears perhaps, where it can't be seen.........Try a little with the thinner, and see how it goes.......... Be careful.