You mean the SILVER accents, correct? If so, you would have to completely strip the factory paint off, then prime them with a plastic binder primer, and then lacquer and clear coat them. Then polish them if you wanted them really glossy.
I t can be done, though. Stripping the old paint off is the key, because that is why they are scratching. The paint they used has a bonding agent in them to avoid having to prime the parts first, but that bonding agent is reacting to everything, and keeping the paint soft. They used the same technique on the painted part of the outside mirrors.