The factors leading to the development of automatic shot‐blasting and pre‐construction priming of heavy steel plate are described in this paper. Pre‐construction primers are used to protect steel against corrosion during fabrication and to form the first coat of the final protective system. The ideal properties of a pre‐construction primer are reviewed and a general survey is made of the different types of pre‐construction primer. These are: barrier coatings, inhibitive primers and zinc primers.
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