WASH PRIMER - A thin, inhibiting primer, usually chromate pigmented, with a polyvinyl butyral binder.
WASHABILITY - Ease with which the dirt can be removed from a paint surface by washing; also refers to the ability of the coating to withstand washing without removal or substantial damage.
WATER CLEANING - Use of pressurized WATER discharged from A nozzle to remove unwanted matter from A surface.
WATER JETTING - Water jetting is the use of standard jetting water at high or ultrahigh pressure (pressures above 69 MPa/10,000 psi) to prepare a surface for recoating high pressure water jetting is cleaning performed at pressures from 69 to 170 MPa (10,000 to 25,000 psi). Ultrahigh pressure water jetting is cleaning performed at pressures above 170 MPa (25,000 psi).
WATER LINE - In general, a waterline is the interface between a body of water and the atmosphere, which typically varies with the level of water. On ships, waterlines are formed on the hull by the water at different levels of draft. - miss, skip, void, discontinuity, vacation.
WATER TRAP - A structural feature in which liquid (such as rainwater) may accumulate from the environment.
WATERBORNE - A paint that uses water as a solvent or thinner.
WATER-BORNE COATINGS - Paint, the vehicle of which is a water emulsion, water dispersion, or ingredients that react chemically with water.
WATERJETTING - Use of standard jetting water discharged from a nozzle at pressures of 70 MPa (10,000 psig) or greater to prepare a surface for coating or inspection.
WEATHERING - Behavior of paint films when exposed to natural weather or accelerated weathering equipment, characterized by changes in color, texture, strength, chemical composition, or other properties.
WEATHERING TOPCOATS - Exterior finishes designed to resist deterioration from ultraviolet light, rain, and other natural destructive elements in the atmosphere.
WEIGHT COATING - An external coating applied to a pipeline to counteract buoyancy.
WELD DECAY - Intergranular corrosion, usually of stainless steel or certain nickel-base alloys, that occurs as the result of sensitization in the heat-affected zone during the welding operation.
WELD ROOT - When looking at the weld profile or cross section, it is the deepest point or points the weld fused into the joint root.
WELD SPATTER - Beads of metal produced during the welding process that adhere to the surface near the weld.
WET FILM GAUGE - Device for measuring wet film thickness of a coating.
WET FILM THICKNESS (WFT) - The thickness of a coating measured immediately after application before any solvent has evaporated or drying has taken place.
WET FILM THICKNESS GAGE, NOTCH TYPE - Gage with one or more faces cut in a series of notches that is used to determine coating wet film thickness as described in ASTM D 4414.
WET SANDBLASTING - The incorporation of water into the sandblasting operation in order to minimize dust.
WET SPONGE TEST - A low-voltage electrical test suitable for detecting discontinuities in thin-film coatings.
WET-ON-WET COATING - Technique of painting whereby further coats are applied before the previous coats have dried, and the composite film then dries as a whole. The process requires specially formulated paints.
WETTING - Power a vehicle possesses of spreading uniformly and rapidly over the surface of pigment particles. A vehicle with good wetting properties assists in the grinding or dispersion of pigments and the ability to wet the surface to which the finished coating is applied. (2) The ability of a coating to come into close contact on surfaces over which it is applied.
WHITE METAL BLAST CLEANED SURFACE - A white metal blast cleaned surface, when viewed without magnification, shall be free of all visible oil, grease, dust, dirt, mill scale, rust, coating, oxides, corrosion products, and other foreign matter.
WHITE RUST - White corrosion products (zinc hydroxide and zinc oxide) on zinc coated surfaces.
WORKING ELECTRODE - The test or specimen electrode in an electrochemical cell.
WRINKLING - Formation of a surface appearance in a coating resembling the skin of a prune, usually caused by application shortcomings.
WROUGHT - Metal in the solid condition that is formed to a desired shape by working (rolling, extruding, forging, etc.), usually at an elevated temperature.