I like doing my bodywork and on first coat hit it with 40 grit, shape it, then 2nd coat sand with 80 grit, feather it out, then with some 180 or 220 go over area quickly one or two passes just to knock down the 80 grit scratches, then i like to apply 2-3 coats of urethane primer, then block sand, 98 % of the time i block sand then prep for paint, if there is still a low area use a polyester glaze, and re prime spot to smooth, sometimes you can get into trouble sanding with real fine grits, IT CAN RING OUT so you see whole repair area, but it can be done, for the average guy i would stick with 40-80 grit then 2-3 good coats of primer with at least 24 hrs inbetween spraying and block sanding, using a guide coat is also a very good way to see any low spots, good luck
1968 Camaro streetfighter, 18x10,18x12 ccw's,tq arm rear,apex c6 front sub,ls6 asa cammed dry sump,t-56,335/30/18 and 275/35/18 toyo r888
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Jake's Rod Shop