I'd suggest hitting a place that can media blast the frame for you. Having had it done a few times, I'll be damned if I'm going to sit with abrasive paper, et. al. to prep a frame anymore.
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Syke
“No one in this world, so far as I know — and I have searched the records for years, and employed agents to help me — has ever lost money by underestimating the intelligence of the great masses of the plain people. Nor has anyone ever lost public office thereby.”
H.L. Mencken, (1926)