to block plumbing pipes and the CAS. Has held up well but I don't really drive this car in the rain -- powder coating would probably be a better choice in those situations.
PS -- My VC's are powder coated and a very good match to my the rattle can ceramic paint on the brake calipers. Nice things about that -- if the VCs get a little dinged working on the engine (and they will) -- the brake paint is good for small touch-ups. Something to keep in mind -- really do believe PC'ing the VCs is a good idea, only from the standpoint of spilling oil when filling the engine.