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with any plastic part it's always a good idea to use what they call "adhesion promoter" it's a primer coat that does just what it sounds like. it promotes adhesion of paints to plastics. You can also sand the part with 600 grit or something to help promote the adhesion as well, but with any sanding you do then you'll need to blow it off with compressed air, use a tack cloth to remove the remaining particles, and then reclean it.
[1] Degrease the thing heavily HEAVILY first. Plastics are made in molds that are full of release greases to get the part out. A light cleaning never gets all that stuff off. If there is any under the paint, meet flaking and bubbling. Degrease it, then clean it with water to get the degreaser off, then you can use adhesion promoter and then paint.
[2]Start spraying before you you contact the part and end spraying after you've gone off the other end. In other words if the part is 18 inches long, you need to be painting about 21 inches so that you don't get any lines on the part.
[3]To make it look really good, do a few coats of paint and let them cure then wet with like 800 or so, then clean and let dry before applying the next coat.
couple coats of paint and a couple of clear will look awesome if you do that. sorry about the novel. and you can get that stuff all at the local parts store.
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