Hi there. I have been using Humbrol grey enamel primer on my 1/12 scale car bodies and then top coating with Duplicolor laquer decanted from the spray can into my airbrush. I thoroughly wash and prepare the surfaces both before and after priming, and allow the primer to dry at least two or three weeks before top coating. The problem i am having is that even after fully curing, the laquer seems to be easily lifted off the primer in certain spots when i try to mask it using masking tape (tamiya). It just lifts and "flakes" in small spots. Is this a common problem using laquers? Is there a better primer to use to enhance bonding with the laquer?
As i said, am am very careful to wash and prepare all surfaces before laying down a new coat of paint, and allow more than enough curing time in between