The Difference Between Polyurethane, Varnish, Shellac and Lacquer: 1) Shellac: This finish is actually a natural product that is very safe once dried and hardened. In addition to adding a protective coat, it also can add a warm amber color to wood. It can be affected by heat (white rings will appear under a hot bowl or mug) or chemicals, so a kitchen table might not be the best place to use it. 2) Polyurethane: a plastic in the form of a liquid until it dries, polyurethane is available in both water- and oil-based options. - Water-based polyurethane: is popular because of its low odor It goes on clear without adding a slight color that oil-based versions can, and it dries much faster. As with shellac, water-based polyurethane wont hold up well to heat and chemicals. - Oil-based polyurethane: is slightly more durable than water-based, especially when it comes to handling heat, so a kitchen table is a good candidate. It adds a slight color tone and will bring out the richness of wood. 3) Varnish: The name of this finish often is used generically for a finish or top coat. Its very durable because it contains a higher ratio of solids. Spar varnish is perfect for outdoor projects and for raw wood used for exterior doors and trim on rustic homes. In addition to protecting the wood, it also provides natural ultraviolet light protection. Spar varnish is often used on items that will be near or on the water, like a wood boat, decks, beach chairs, etc. 4) Lacquer: provides an extremely intense gloss finish. It is extremely durable and resistant to damage; however, over time it can begin to discolor and become scratched. Wonder why its so smooth? Its applied via a sprayer, because it is more viscous (thinner) than the other finishes.
Posted on: Thu, 20 Mar 2014 18:00:01 +0000
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