To try and help you, but not used vinyl myself as a mask. When applying the mask, you must ensure it is burnished down so there are no gaps. Also, when applying the paint, you need to do light coats initially. With Pinstripes, I do try to do them first if possible to.
So, check airbrush pressure isn't to high, check suitability of thevinyl (RCS Graphics can help you there) and look at the way you are laying up the paint.
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