I've been using lacquer thinner for the last couple of cover jobs I've done, and it works just fine. Still use the MEK to thin the poly tack though. Don't use the blue painter's masking tape for masking for trim paint, the glue will transfer to the paint from the tape and it will be a real pain to get it off. Guess how I know that. Use the green 3M masking tape and don't leave it on any longer than you need to. JImChuk