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August 13 - August 17, 2018

Which DFT statistics should be recorded in a daily inspection report, and why are they relevant to a good coating QC record?

Selected Answers

From Jeff Kim of Sherwin-Williams on August 21, 2018:
It‘s important to measure and record the DFT readings of any primers or intermediate coats applied the previous day or days, before applying another coat. Because these previously applied coats were likely not dry enough to measure DFT the day they were applied, it’s imperative that any non-compliance is identified and dealt with before “burying” the problem.

From Ryder Ruschke of Rumford Industrial Group on August 15, 2018:
Depending on the project, a good rule of thumb would be to follow PA-2. Unfortunately, this isn't a one-size-fits-all, and each job specification should be written specifically for that job as the needs of a tank lining are different for field welds/touch up. I think the most important readings are the ones that are considered out of spec, and what was done to correct the deficient areas. After this, you would want to show your average, range, and the standard deviation can be useful as well to determine how consistent the mil thickness was. It is relevant to a good coatings QC record if there is an issue with the coating system or a failure in the future. It protects the coating contractor from potential rework or even worse, litigation.

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Tagged categories: Coating / Film thickness; Dry Film Thickness (DFT); Quality Control; Quality control

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