depends what you're painting...solid colors, yes, 'color sand' before clearcote...metalics and pearls, NO as this tends to swirl or, muddy the finish, in this case you do ALL the polishing on the clear, so have ample clear on... i use #2000 wet every 2nd coat of clear..i also do this in the color phase, helps for a smoother, final finish that glosses nicely...