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What is a “Dust-Free Surface?” ISO Method Versus Practical Evaluation

When a coating system fails prematurely, it is rarely because of the coating itself. Either the surface preparation was inadequate, the surface was contaminated, or the coating was mixed or applied incorrectly. As the old adage goes, a house is only as strong as the foundation it is built on. When it comes to coatings, …

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The case of…the red rust on a newly applied zinc primer

Photo by Jonny Scholes In this Case from the F-Files, large steel components for a new facility being constructed in the U.S. were fabricated, prepared, and coated overseas with an inorganic zinc primer (IOZ). Upon delivery to an inland river port in the U.S., the components were unloaded for additional assembly work and found to have …

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Case Study: Roof Coatings Flunk Out

Premature coating problems on the standing seam roofs of two school buildings were an eyesore for the community and an issue for the school board that was trying to improve the school’s image. This article describes the site investigation, the forensic laboratory analysis, and what ultimately caused the coating to detach.Embarrassed that the four-year-old roof …

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The Case of Surprise Blistering and Rusting on a New Tank Lining System

From JPCL, July 2012 In this month’s F-Files, blisters formed in a lining system installed on the interior of a raw water storage tank that was constructed at a new power plant. Because careful quality control and quality assurance inspection measures were taken from the time blast cleaning began through complete curing of the lining system, it …

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Ethics of Coatings Failure Investigations

The Ethics of Coatings Failure Investigations

“The Case of… Three (Consultants),” a two-part F-Files column published in the November and December 2010 issues of JPCL,1 described observations and conclusions reached by three different consultants, each looking at the same bridge coating system. The article pointed out that clients sometimes retain consultants to perform very specific and limited examinations of the alleged failing coatings. …

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