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The resulting shellac powder fills in the wood pores at least as well as, and often better than, pumice. The subsequent shellac coats will liquefy and surround this dust, filling in and sealing the wood pores like pumice would. The fad is often lubricated with an oil that then becomes integrated into the overall finish. [6]
Excellent. It finishes hard and can be buffed to a gloss. Use a release agent. A thick finish can leave a plastic feel. 2-Part polyurethane: Transparent Stronger protection than regular polyurethane varnish Durable once cured, generally less than an hour low or free of VOCs, nonreactive when cured
This dissolved shellac liquid, applied to a piece of wood, is an evaporative finish: the alcohol of the shellac mixture evaporates, leaving behind a protective film. [ 39 ] Shellac as wood finish is natural and non-toxic in its pure form.
Shellac is the basis of French polish, which for centuries has been the preferred finish for fine furniture. Specified "dewaxed" shellac has been processed to remove the waxy substances from original shellac and can be used as a primer and sanding-sealer substrate for other finishes such as polyurethanes, alkyds, oils, and acrylics.
Relative to oil or shellac varnishes, polyurethane varnish forms a harder film which tends to de-laminate if subjected to heat or shock, fracturing the film and leaving white patches. This tendency increases when it is applied over softer woods like pine. This is also in part due to polyurethane's lesser penetration into the wood.
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Shellac is the secretion of the lac bug (Tachardia lacca Kerr. or Laccifer lacca). It is used for wood finish, lacquerware, skin cosmetic, ornaments, dye for textiles, production of different grades of shellac for surface coating. [7] [9] [10]
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