Re: patch panel prep.
I wouldn't paint over rust with anything. I believe the rust will come back sooner or later. 50 grit on a wheel? ebfabman, what type of wheel? Angle grinder with sanding disc? Flap wheel?
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'72 GMC SWB C1500 Custom, frame-off in progress. 383 SBC, 9:1CR, Comp Cams XE262H, Scat internal balanced crank, Eagle SIR 6" rods, Keith Black dish pistons, Dart Iron Eagle 72/180 heads, Weiand Stealth intake, Stewart stage I water pump, Holley 4bbl vac sec, TH350 with B&M Shift Improver Kit. 12 bolt positraction.  
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