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GLOSSARY (CONT)
Surface Treatment The application of a pretreatment coating to a cleaned and bare metal surface, to
provide initial corrosion protection and adhesive bonding of the primer coats to the metal surface.
Tack Coat When a coat of paint cure to when a finger tip pressed lightly against the film leaves only a
slight impression and none of the film sticks to the finger.
Tapering Becoming gradually narrower
Threshold Limit Value (TLV) The airborne concentration of a potentially toxic substance to which it is
believed that healthy working adults may be exposed safely through a 40 hour working week and a full
working life. This concentration is measured as a time weighted average concentration. They are
developed only as guidelines to assist in the control of health hazards and are not developed for use as
legal standards
Touchup Painting The process of repairing a damaged paint system to prevent the undercutting of
existing paint by corrosion.
Undercoats The underlying layers of paint below the finish coat.
Underbody The exterior hull surfaces normally under water when craft is afloat.
Upper Explosive Limit (UEL) The maximum concentration of flammable vapor in air above which
propagation of flame does not occur on contact with a source of ignition.
Vinyl Paints A plastic resin coating that has outstanding durability.
Watercraft A term that includes all marine equipment used by the Army. TM 55-500 provides
characteristics of the equipment currently in use.
Zinc Protectors High purity zinc anodes attached to metal surfaces to provide corrosion protection by
galvanic action in a water environment.
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