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.

UNDERCOAT:
A coating, generally pigmented, that provides improved adhesion and/or maximized gloss and uniformity of a finish coat when used on bare wood.

UNDERTONE:
A subtle or subdued color of limited intensity that lends character to the dominant color of a coating.

URETHANE:
A type of binder used in coatings. Characterized by excellent flexibility and chemical resistance. For more information, see URETHANE in the FAQ section.

URETHANE-MODIFIED ALKYD:
An alkyd that has been chemically modified for improved flexibility and chemical resistance. A binder used in "polyurethane" varnishes.

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).

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