Abstract
Abstract A detailed account is given of results of tests made to determine the effectiveness of coatings for underwater metal surfaces on lock and dam components along the upper Mississippi River. Testing periods varied considerably, extending in some cases to as much as 18 years. Data obtained on more than 190 panels are given and results are reported regarding the longevity of various paint systems. Pigmentation formulae, pigment-vehicle ratios and composition of vehicles are given as is surface preparation of panel, coating system used, and life of primer and finish. Topics discussed include preparation of metal surfaces, sand reinforcement, use of multiple paint coats, use of inhibitive primers, intercoat adhesion, suitability of the various vehicles available, use of coal tar and asphalts, use of hot spray metal coatings, thickness of paint films, use of aluminum and use of rubber. 5.4.8
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