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Alkyds, the much-trusted coatings of the past were summarily replaced by the superior performance of the polyurethane coatings. The polyurethanes were then supplemented by the polyurethane with clear coat and the polyurethane with UV protector. These coatings promised a twenty-year life and resistance to fading. But now, those coatings are being challenged by the newcomer on the block, the ultra-high performance coatings which are promoted to perform well for up to thirty years.
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Current and future coating restrictions that reduce atmospheric emissions as well as the potential for the leaching of chemicals into drinking water systems are pushing tank owners and/or specifiers towards the use of 100% Solids by Volume (SBV) coatings. A majority of these high solids coatings whether epoxy, polyurethane, or polyurea, can or should be and in some instances must be, applied using Plural Component (PC) spray equipment.
Fourteen countries, 20 states, and 76 bases…that sounds like quite a deployment! But what if, instead, you are charged with the evaluation and maintenance of over 500 water-storage tanks and related structures on those bases. Who would you turn to for professional guidance? How would you keep all of the details of the structures’ conditions and recommendations for maintenance organized in a manner that would allow you to rate and prioritize tank maintenance requirements?
This paper will discuss common coating failures seen in water storage tanks and discuss how these failures can be addressed by the use of OAP coatings designed for potable water service.