Pool plaster diamond polishing pad 120 grit is designed to polish marble and quartz pool finishes. Used to polish Durazzo Polished Marble Pool Finish and Hydrazzo Polished Marble Pool Finishes. Pebble Shine Diamond Disc 120 grit. Our NON-CORROSIVE Pool Plaster Disc has been used in polishing swimming pool plaster since 1986. Unlike all other Diamond Disc, our diamonds are bonded with a specific NON-CORROSIVE material ensuring no rust or corrosion stains from residual material. Pool plaster sanding disc works on all pool plaster finishes. When using a pool plaster disc without water it is important not to overheat the disc by doing a 5 Ft. x 5 Ft. area then use a hose to wash off plaster residual material remaining. This will keep the pool plaster disc and pool plaster from overheating. Excessive heat will cause break down in the integrity of both pool plaster disc and pool plaster. Maximum 3500 RPMs. Our 7" diameter hook and loop backer pad AG7529 used with our Pool Plaster Diamond Pad 120 Grit ensure 100% contact with the pool plaster finish you are resurfacing. (using a smaller diameter backing pad will cause the pool plaster disc to wear uneven and reduce the life of the pool plaster disc) Pool Plaster Polishing Pads. See our How To Repair Rough Pool Plaster page for more information.