Collinite No. 920 Fiberglass Boat Cleaner is designed to restore neglected fiberglass finishes affected by weathering and adequately preps surfaces for follow-up wax application. This easy to use compound removes film, light oxidation, discoloration and chalkiness from fiberglass boat finishes. Using this product before wax application can improve the wax’s ability to bond, allowing for an easier spread and longer staying power.