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I did this too. Started with 400 grit on a drill with a hook and loop pad with a 1/2" interface pad, then went to 800 grit, did 3 light coats of uv protective clear, then 5 fat coats of metal ef'x, then then a quick scuff with the 800 again, then 4 more coats of the uv protective. The sparkle from the metal ef'x is subtle but I like it. Before/during headlight restoration After. Restoration is complete.