A paint job is only as good as the surface preperation. The surfaces should have been at least scuffed up or sanded then cleaned with a pre painting solvent that removes all grease and waxes. Even your fingerprints have enough oil to ruin a paint job. I suggest stripping off all of the clear and black, totally sand the silver as to create a surface that the new paint can bond to. Clean the to be painted surface with a wax/grease remover (check with a local automotive paint supplier for proper cleaner) DO NOT TOUCH THE CLEAN SURFACE WITH BARE HANDS! then have at her with the paint and clear coat. Let them dry at least as long as recomended...be patient grasshopper. You will be pleased with the results. Good Luck.