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Premature failures of coatings applied to galvanized mast arms is not an unfamiliar problem. The properties of galvanizing that make it a difficult substrate to coat when new don’t simply disappear from beneath the original coating system.
Premature failures of coatings applied to galvanized mast arms is not an unfamiliar problem. The properties of galvanizing that make it a difficult substrate to coat when new don’t simply disappear from beneath the original coating system. When maintenance painting is necessary after a few years of service, long term success can be elusive. This paper will discuss the development of maintenance painting process developed to accommodate budget constraints and produce a satisfactory outcome.
The long term performance of any coating system will be limited by the ability of the applicator to achieve the best combination of surface preparation, application, and curing. In oil and gas facility construction, sometimes the most appropriate coating system is not the best available technology, but rather the system that ensures the highest probability for success based on the environmental conditions during application. An example is presented in which a zinc rich epoxy coating provides clear advantages over the specified inorganic zinc silicate due to circumstances specific to the particular application.
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Overcoating and other maintenance painting practices of the Texas Department of Transportation are discussed.
The paper will be a discussion of the various generic lining products available in the marketplace today, required application methods and potential issues associated with each. Additional discussion will take place around ancillary work required to achieve a successful long-term installation.