Plastic will paint fine, and in my experience 24087 will stick to pretty much anything. Just be sure to get it really clean.
The best way I find to prep plastic for this type of thing is to use a Scotchbrite pad, and AJAX cleanser. Scrub it really well with hot water. This scuffs and cleans it all at the same time and gives a good base for your paint.
We paint a lot of motorcycle plastic parts and we prep it the same as anything else, using fine grit sandpaper to progressively get the surface smooth enough for paint.
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