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September 3 - September 6, 2019

Is there any method to take accurate wet film thickness readings when applying zinc rich primers?

Selected Answers

From Per Gabrielsson of Free Lance Consultations and Inspections on September 9, 2019:
Wft: accurate readings not possible. Dft: when a scraper end gives a smooth "feeling" and sound, it's OK.

From Erik Andreassen of CPS on September 6, 2019:
You could try, but it's highly unlikely you would get an accurate reading. We here in hot climates have to add a percentage of solvent to avoid fast evaporation between the gun and the substrate and to avoid dry spray. A good applicator can tell the amount required to reach a specified dft; it comes with experience and training.Wet film readings are so fast it's pointless.

From Ivars Jakobsons of Redwave on September 3, 2019:
To my understanding, wet film thickness (WFT) measurements always are more of an indicative nature. The same goes for dry film thickness measurements as long as the gauge is not precisely calibrated on the exact surface.

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Tagged categories: Coating / Film thickness; Primers; Quality Control; Zinc-rich (inorganic); Zinc-rich (organic)

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