Old Masters spar marine varnish is a durable exterior coating. This product can be used on wood, fiberglass, coated metal or painted surfaces. It contains ultra violet absorbers for advanced sun protection. For use on exterior surfaces such as fences, railings, lawn furniture, doors and above the water-line marine surfaces. All surfaces must be clean, dry, and free from dirt, wax, grease, glue and other contaminants or penetration and adhesion will be affected. Wood surfaces must be sanded smooth and sanding dust removed. Wood that has been stained or finished should dry completely (24 hours) before application of gel polyurethane. In case of high humidity, overnight drying may be necessary. Under ideal drying conditions, allow 6 hours before recoating. Drying time will be affected by temperature, humidity and film thickness. Protect product from freezing prior to and during application. Using a cleaning solvent, such as paint thinner or mineral spirits, is recommended for cleanup. The use of paint thinners or mineral spirits may violate VOC compliancy in your area.