On pretty much every part, no matter how big or small, we blast, etch, seal, paint (single stage urethane or bc/cc with flattening agent if varying gloss needed), and bake.
http://i20.photobucket.com/albums/b2...Z/100_0439.jpg
http://i20.photobucket.com/albums/b2...Z/100_0443.jpg
Like Chuck mentioned, many people use rattle can, and have had good results. Myself, I dont have that much faith in them. Especially on someone else's car with my name/rep attached to it.
dave