Best Spar Urethane. Spar urethane, of which minwax helmsman is a leading brand, is spar varnish that includes urethane plastic as one it's a little too thick for spraying, although you can thin it if spraying is the best option. The question is is spar urethane a good way to seal the wood? What is best for marine wood?
What is best for marine wood?
So on to a new pair of booms in the final. Minwax® helmsman® spar urethane is specially formulated as a protective clear finish for exterior follow directions for application instructions and dry times. A thin application is required to prevent drips. Any suggestions on the best spar urethane? This is a clear coating that is meant to be used anywhere, whether indoors or outdoors, and we can see that it. So on to a new pair of booms in the final. Shop menards for spar urethane to protect and beautify your outdoor projects. Two weeks ago i finished some outrigger canoe booms by spraying spar urethane and it turned out good.