Analysis of Immersion Primers in Water Tank Coatings

This technical report examines the engineering history of corrosion protection and lining systems for water tanks, focusing specifically on immersion primers. The author presents a detailed review of the two most commonly specified primer types in the potable water tank industry: solvent borne epoxies and moisture cured urethane zinc primers. The report outlines the engineering, application, and cost considerations associated with these primer types. It aims to provide a comprehensive understanding of immersion primer selection, concluding that moisture cured urethane zinc primers do not present a significant performance or cost advantage over non-zinc filled epoxy primers, despite their prevalence in specification literature. The document also discusses the functions of immersion primers, including flash rust prevention, adhesion enhancement, and their role in the complete lining system. Additionally, it references industry standards such as AWWA D102 for guidance on primer selection and application in water tank linings.