Sounds goofy to me. Aluminum would not corrode during shipping. Why would spray paint come off? Carl, my woodsy friend, does it look like aluminum dust or paint? Were you huffing any silver paint lately and got some on your hands? I have purchased aluminum radiators and seen many more. They were always just raw aluminum. I don't paint them, I leave them aluminum. My motto on some items that don't need painted like slump block house, new cedar fence, aluminum is: Once you paint it, you will have to paint it again someday soon... and again. Wash it with soap and water and see. If it is localized, could it be flux, welding residue or filings? I think a raw aluminum radiator looks nice.
Highly irregular for a company to advertise, build, photograph, and then paint it some crappy silver, before shipping to a customer, that comes off on their hands and have to clean.
Also, Remind me not to buy one through Eastwood or your vendor.

Your Humble Genius (based on estimated I.Q.),
Bartamos


Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn