Tim, et.al.
You are correct. The caps are done differently. There are a few ways that they can be done. Any paint (epoxy type is best) that has a carrier which can chemically "dissolve" the plastic's surface (only) will create a strong chemical bond or "weld" when it dries. For obvious reasons, epoxy based paint dries harder than anything else. Another alternative is the coating which many manufacturers use as pick-up truck bedliner coatings. This stuff adheres as tenaciously as anything you will find. DRTY coated his front grille with this stuff in black, so you may want to talk with him about it. It dries very hard, though not as much so as pure epoxy.
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