Yacht Varnish is made with Tung Oil to give boats and other outdoor woodwork the most protection and durability. Yacht Varnish is a very long-lasting varnish made from a solvent. It was first used on boats to protect the wood and keep it from rotting over time. If floor varnishes are applied to wood that will be exposed to the elements and requires flexibility, they may be overly rigid and prone to breaking. They may also break down in the high UV light. If you use yacht varnish on a floor that gets a lot of use, it won't be hard enough and will wear out faster than it should. This product is often used to give outdoor furniture a high-gloss finish that will last a long time.