Clear, high gloss, exterior and interior, the most durable varnish available. A tough, light fast, non-chalking, weather chemical and solvent resistant two-part urethane varnish especially for aircraft and marine wood surfaces which will be exposed to severe environmental conditions. Catalyst must be ordered separately. Mix Ratio: 1 part catalyst to 2 parts base. Coverage: 1 gallon catalyzed base, reduced 25% will cover apx. 600 sf – one coat. Order catalyst separately U865-1/2 pt or quart. Gallons require hazardous material fees. Quarts and gallons must be sent UPS ground. Shelf life is 4 years unopened.