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This is of particular interest in the area of polyurethane coatings, where light stability is a critical factor and is the main reason that aliphatic isocyanates are used in making polyurethane coatings. When PU foam, which is made using aromatic isocyanates, is exposed to visible light, it discolors, turning from off-white to yellow to reddish ...
Up to 85% of Lacquer paint can evaporate into the air, polluting the atmosphere. Enamel paint is better for the environment and replaced lacquer paint in the late 20th century. [1] Water-based acrylic polyurethane enamels are now almost universally used as the basecoat with a clearcoat. [3]
Lacquer dish with Chinese character for longevity, mid 16th century Maki-e sake bottle with Tokugawa clan's mon, Japan, Edo period Lacquer plate, Nam Định province, Vietnam, Nguyễn dynasty Lacquer is a type of hard and usually shiny coating or finish applied to materials such as wood or metal.
Metallic paints, or just metallics, generally consist of a base coat with a clear "lacquer", usually a transparent acrylic polyurethane top coat, for protection and extra gloss.
Lacquer is typically sprayed on, within a spray booth that evacuates overspray and minimizes the risk of combustion. The rule of thumb is that a clear wood finish formulated to be sprayed is a lacquer, but if it is formulated to be brushed on then it is a varnish. Thus, by far most pieces of wooden furniture are lacquered. [citation needed]
Shellac is much softer than Urushi lacquer, for instance, which is far superior with regard to both chemical and mechanical resistance. [citation needed] But damaged shellac can easily be touched up with another coat of shellac (unlike polyurethane, which chemically cures to a solid) because the new coat merges with and bonds to the existing ...