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U.S. Gallon - A unit of volume equal to four liquid quarts, eight liquid pints, 231 cubic inches, or 3.785 liters. A U.S. gallon of water weighs 8.33 pounds (3.78 kg).
Ultraviolet Absorber - A substance used in some exterior coating that absorbs UV radiation, and reduces or delays damaging UV effects from sunshine to the coating or substrate.
Ultraviolet Radiation (UV) - The portion of the radiant energy of the sun's spectrum that causes damage to coatings and sealants and to the surface of unprotected wood.
Ultraviolet Resistance - The ability of a coating or sealant to remain undamaged when subjected to UV radiation, as from direct sunlight.
Ultraviolet-Curable Coating Material - A coating which cures upon exposure to ultraviolet radiation.
Umber - (See Burnt umber)
Undercoat - The fIrst coat or a coating applied prior to fInish coats or top coats of paint. Also called prime coat.
Undertone - The color obtained when pigment is reduced with a large amount of white pigment and a faint subdued color can be seen through other colors.
Union Shop - A firm whose employees are covered by collective bargaining agreements.
Urethane - An important resin in the coatings industry. A true urethane coating is a two-component product that cures when an isocyanate (the catalyst) prompts a chemical reaction that unites the components.
Urethane - Polyurethane.
Urethane Coating Material - A coating material made from urethane material. ASTM has defined five kinds of urethane coatings.
Urethane Paint - Paint that is made with urethane material. Urethane paint generally possesses good weathering characteristics along with high resistance to stains, water, and abrasion.
Urethane-Modified Alkyd - An alkyd that has been chemically modified for improved flexibility and chemical resistance. A binder used in "polyurethane" varnishes.
Useful Life - The life span of a paint coating.
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