Khalid........is there any way you could shoot a lacquer coat over it (or get someone else to do it for you?). Had the same problem in the past, with masking lifting paint when you peel it off. If you can shoot a lacquer coat over it between your maskings it seals in your paint and it won't lift again
I have read elsewhere that applying masking film before your basecolour paint is fully dried out can also lead to it lifting, and in my own experience, rubbing down to too smooth a surface on 'sealing' lacquer coats can also lead to subsequent paint coats lifting - as paint needs some roughness to key onto.
Hope this helps
