Painting plastic you have to use a primer AND plastic paint. I don't know of a non spray plastic paint. Otherwise it will just scrape right off. I've painted a few Nerf guns with success using primer and plastic spray paint, and I've had them a few year posing and taking them in and out of holsters and the paint is still on there good.
__________________  The T.U.B. Pack! Toto, Uni, & Bindi
RIP Lord Scrappington Montgomery McLimpybottom aka El Lenguo the Handicapped Ninja 10-12-12 
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