A brief outline is given of the history of wash primers with emphasis on laboratory research. A mechanism is postulated to explain the loss of adhesion with time of WP-1. Topics discussed include phase rule studies of zinc tetraoxychromate, intrinsic viscosities of recovered polymers, reactions involving formation of phosphorus-chromius-resin complex, deposition of tertiary zinc phosphate on metal, and modifications made in WP-1. Several organic structural formulae are included.


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