Does 303 Protectant always work on fiberglass?
Boaters and RVers use 303 Protectant to restore a like new color and gloss to faded and oxidized gelcoat fiberglass…and to keep their fiberglass looking like new without ever having to buff and wax. Yes, 303 always works unless there is something on the surface keeping the 303 away from the fiberglass. This something can be a Teflon, silicone or polymer sealant or fresh wax. If the surface has been freshly waxed, there is no need to remove the wax. Instead, just wait a few weeks. Wax does not last long enough to warrant the effort required to remove it. Only about 2% of the time is prebuffing (compounding) necessary prior to using 303. When compounding is required to remove the heavy layer of accumulated oxidation, be sure to use a rubbing compound that does not leave a coating or sealant. Use one containing only the finest abrasive.
