If you've been looking for a fast acting, consistent grinding and long lasting diamond belt for your pre-polish needs on glass, then you should take a look at 3M's 651WY Diamond cloth belts. Encapsulated diamond in a resin matrix on a tough cloth backing, these belts make short work of your glass finishing needs and leave a gorgeous surface to move to a polish from.
Please be aware that these belts are SPECIAL ORDER Items and will take 4 to 6 weeks for delivery.