The toughest coating / paint I know of ( short of powder coating) is a true two part epoxy. The single part "epoxies" in a can dont even come close, because they are not real epoxy coatings. The only down side is that you need a rig to spray them either a all in one HPLV ( high pressure low volume) set up , or a HPLV gun and an air compressor. Or you can always get a stainless steel receiver for it and not have to worry about it.
Last edited by iron cannon; 02-02-2013 at 10:43 AM..