Hi sorry if this has been asked before, my bay has a sticker behind the passenger seat saying refinished in dulon acrylic laquer. Now the paint is 40 years old and as a test I have painted a small area directly with L90d cellulose with a brush straight on top around 6 weeks ago this has not reacted. Can I paint the van with celly or should I have to strip all of the paint or use an isolator to be safe?