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Hal: This is one of the truly great uses for Phosphoric Acid. If you let it dry, it will form a thin phosphate barrier and protect the iron from rusting. When it is time to paint, you can prin\me or paint right over it. When you see "self-etching" primers, they have a bit of Phosphoric Acid in them to do this. It etches, then dries and remains behind albeit covered by primer pigment. So....put it on now and let it dry, and when you're ready to prime, you could scuff it smooth with sand paper, or just give it rub with some Scotch-Brite. You really don't have to do either because it's paintable. You're just scuffing it to make it a bit smoother. On cast iron it will be difficult to see if you've scuffed it or let it be. I like to rub it down with Scotch-Brite, then blow off the dust, then maybe wipe it down with some wax and grease remover, then prime. Hope it works for you. Frank-in-Ireland
70D // 855
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