Automotive Paint -What can't you mix? How long can it store?

Is there an epoxy sealer in any of the clear coat paints? I live on the east coast, and if you can believe it, there is salt or some form of alkaline ph in the air here right off the coast that would corrode automotive clear coat (on all of the older local cars) , non- -ferrous alloys, and chrome significantly enough to notice when I was last on shore duty-while paying attention to all of the cars on base/locally.