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October 30 - November 3, 2017

How do you account for the profile of blasted steel when taking a dry film thickness reading?


Selected Answers

From Yan Lin, Yu of DNVGL on November 23, 2017:
Can the author of the question be more specific? In the case of dry film thickness of a shop primer,  this is not an application for measuring directly on profiled substrate, but on a smooth panel.

From Daniel Pena of A One Aircraft Paint on November 3, 2017:
One dry film thickness instrument has a feature that  measures individual coating layers (DFT of the primer), excluding the substrate irregularities.

From Jose Avendano of CoatProtec, LLC on November 3, 2017:
Usually, I adjust my DFT Type 2 Gage with a 2-points calibration over the blast profile. With DFT Type 1 Gage, it is necessary to obtain the Base Metal Reading (BMR) and adjust the readings using certified coated thickness standards.

From Steve Brunner of WPC Technologies on October 30, 2017:
One of the best ways to account for blast profile is to zero and calibrate the dry film thickness meter on the blasted part prior to application. Since this is not always possible, a comparable metal plate with the same blast profile and curvatur,e if applicable, can be used for calibration.

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Tagged categories: Surface Preparation; Surface profile


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