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Spar Urethane is considered to be much easier to apply than polyurethane. It is applied in the same manner like polyurethane; however, it tends to dry faster and doesn’t require a lot of layers and application to achieve a shiny finish. Spar urethane cures by oxidation, not by drying, so make sure air circulates.Click to see full answer. Keeping this in view, can you mix spar urethane with polyurethane?On the other hand, spar urethane is stronger of the two, and it will coat square feet per gallon, while polyurethane will stick with more problem on the surfaces. Polyurethane finish features a few downsides because it cures, sets and rises more slowly than spar urethane that could dry in a matter of minutes.Furthermore, is polyurethane better than spar urethane? The key advantages of Spar Urethane are the flexibility and UV resistance (similar to Varnish) which makes it a better choice compared to polyurethane when it comes to exterior uses. Polyurethane may be a better choice for indoor application, thanks to its hard-protective coat. Consequently, can you put exterior polyurethane over interior polyurethane? Exterior polyurethane contains polyurethane resin, a flatting agent that reduces the gloss, ultraviolet absorber and solvent. Most polyurethanes rated for exterior use will be oil based. Don’t attempt to use an interior polyurethane outside because the finish will peel off very quickly.How long does Helmsman Spar Urethane last? Product Details Sheens: gloss, semi-gloss, satin Application Tool: natural bristle brush Location: interior and exterior wood surfaces Recoat: after 4 hours Dry Time: 24 hours before normal use

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