I just received a new aluminum radiator. I want to paint it black in the areas that will be visible once installed just for cosmetic purposes.
My problem is, there is a silvery substance which comes off when you rub it with with your fingers.
Any idea what it is and what is the best way to either prepare it for paint or remove it prior to paint?
Carl

1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission