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I didn't mean the paints won't stick to the plastic as they do stick very well, but try masking it and see what I mean.
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Hmmm... I do mask fairly regularly as most of my models are multi-color jobs and have not had any lifting problems. I use a few different masking tapes, and although none of them are super high-tack, they're not exceptionally "low-tack" tapes, either. My cure times aren't even all that long, I typically shoot and mask for the next layer within a day. Of course, it does help that I live in exceptionally dry Colorado.
My best guess about why I've had good luck is that I use Benjamin Moore "Fresh Start" primer (thinned, of course). Yes, this is the stuff one buys by the gallon at the house paint store. Among professional house painters, this product is known to bond exceptionally well to all sorts of substrates and to subsequent top-coats. House painters must deal with all sorts of less-than-ideal substrates and good primers are the way they can have confidence in few callbacks. I did some experimentation a few years back and find that house paint primer is just great stuff even on finely detailed models.
I don't use typical spray-can primers anymore, so I can't comment on how well the craft paints will stick on top of those products.