Introduction This guide represents a consensus on best industry practice for shop application of zinc rich primers to previously uncoated bridge steel and includes the proper preparation of the steel surfaces and the mixing@ application@ and cure of coatings. To simplify the application parameters for a system based on zinc-rich primers on new steel bridges@ a series of charts have been developed. These charts provide a convenient summary listing the detailed requirements for surface preparation@ environmental conditions@ coating application@ curing@ and verification testing. The guide addresses a three-coat system consisting of primer@ intermediate coat@ and topcoat@ but is appropriate for application of a two-coat system or primer only. Environmental@ containment@ and safety issues referenced herein are outside the scope of this guide and should be addressed in other documents. This guide uses mandatory (imperative) language to assist owners and specifiers with development of contract language.