Silica sand is made of round particles and would probably not be very aggressive in removing rust and paint, but it probably wouldn't hurt to try.
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-Jeremy
1968 GTO 4-spd convertible, console, factory gauges, hidden headlights, 3.90:1 posi, AM/FM radio.
1962 Catalina convertible, Starlight black w maroon interior & white top.
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