Polypropaline doesn't bond to much of anything. In order to get a permanent bond it needs a surface treatment. In industrial settings the preferred method is to expose it to fluorine gas but that's REALLY nasty stuff and not for amateures. A much safer, though less effective, alternative is ozone. Put the model in a tightly sealed closet with an ozone generator for a few days and paint it right away becaus the surface effect of ozone wears off. Anything that sparks, like an electric motor with worn out brushes, makes ozone, so do un- insulated high voltage metal plates, like those ionic air fresheners. If you try it be careful not to start a fire!
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