What Is the Difference between Shellac?

Answer

The difference between SPAR urethane and polyurethane is its chemical structure. A polyurethane is simply a polymer while a SPAR urethane is composed of a chemical group. Aside from this, the two are basically the same in function.
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Hi Carroll, basically it's the types of resins used in the varnish, traditional Spar has an Alkyd base, with Phenolics, Tung oils, other resins and yields a glossy, water resistant
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Spar urethenes and spar varnish are different formulations. Urethene, naturally is a urethene based product, whereas varnish in the traditional formulas had linseed oil as well as
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Polyurethane is, scientifically speaking, a polymer. The chain of organic units that makes up polyurethane is actually made of links of urethane. Urethane is also ...
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