Actually, this is a good question as I have yet to put mine on. I'm doing the Jedi bucket, but the last time I tried to do kill makrs, the paint bled through and made a mess. How do I keep the paint from bleeding through the tape?
Are you airbrushing? or spray painting? Either way a light coat of clear over the masking tape will help seal it. Then spray a couple light coats of the paint as opposed to one heavy coat. I have used this technique on models for years with great results. Practice first.