i'VE used mine and the ones at the pro shop many, many times,...4000 is very fine,..I make sure,..(as you do I'm sure), to use plenty of water t0 keep the junk out off the pad,...4000 on some of my balls will leave a nice shine when followed up with a clean wet towel,..4000's don't do much, but they give a great slick surface without polish,..which holds up much longer,...I don't think they should wear after a couple uses,..mine haven't...