Spar Urethane Over Polyurethane. Do you all prefer spar urethane over poly? Polyurethane, whether it's an outdoor or indoor formula, takes a little finesse to apply without bubbles or brush strokes. Spar varnish got this nickname due to the wooden poles you used to find on a marine ship.

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I called the manufacturer of this product right away i did all the steps per the manufacturers advice over the phone and it still looks terrible even though. Always spot test on a hidden area to. What's the difference between spar urethane and polyurethane?

Hard urethanes won't last over a soft spar varnish finish.

You need to use the right brush and it takes a little practice. The spar urethane undercoat may make your new coat of paint more vulnerable to chipping or premature failure. Like spar urethane, polyurethane is a plastic resin that is carried in water. Minwax helmsman spar urethane is a specially formulated protective clear finish for exterior or interior wood protects wood that is exposed to sunlight, water Have in mind that main ingredients that it features. Premium outdoor polyurethane coating continues to deepen its amber look over time to give wood. Gotta agree with jf on this one. I am using helmsman spar urethane to refinish the front door of our house.