[volksworld]

the finish on blasting has everything to do with what grit is used...aggressive media used for fast rust removal can leave the surface rougher than it started out...finer grit leaves a better finish but takes a heck of a lot longer and therefore uses much more media....i use 180 grit aluminum oxide in my blast cabinet which leaves a finish i can prime and paint without sanding....but its still a casting which is pretty much molten iron poured into sand...blasting will knock off rust but the only way to get it really smooth is sanding or filler