I find those foam block leave to many "waves" in the clear/topcoat leaving you with the "water ripple" effect in your final finish, esp, dark colors, rather than a "flat mirror" reflection,........heres's a car that I wet sanded out using a hard rubber 3"X5"X1/2" pad/block,(avaiable at most automotive paint suppliers) and the true and tried paint stick( local hardware store, mixing/stiring sticks).....started with 1000, then 1500, then 2000, finihed with 3000 grit.....minimal amount of machine polishing needed afterwards