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Question posted - October 3 to October 9, 2011:

When applying a 100% solids, fast-curing polyurea coating on concrete, what is the best method for verifying that the proper thickness has been applied?


Selected Answers

From David Cerchie of Versaflex Inc. on July 17, 2012:
The UT, stroke count and embedded metal plate methods are all suitable. Because of the very fast initial reactions of sprayed polyurea systems, wet-film measurements are virtually impossible. Furthermore, pure polyurea systems are normally 100% solids,  so wet film thickness will equal dry film thickness. Additionally, due to the fast initial cure, surface topography is not a consideration as there will be very little flattening of the coating system. Depending on the spray gun used, there can be varying amounts of air entrainment in the sprayed systems, but generally that does not effect the UT measurements if the gauge is properly set. Some polyurea manufacturers can provide compatible hand repair polyurea if destructive testing is the only available method.

From MIKE LEARNED of NEW HABIT INC on November 22, 2011:
"MIC" a coated shim!!!

From Tom Swan of M-TEST on October 4, 2011:
The two best non-destructive methods are 1) using a UT (ultrasonic thickness) gauge preset to measure coatings over concrete. If you are a UT person, you can use a regular UT gauge, but you need the proper probe with the proper gate settings. This is good up to about 150 mil coatings. 2) The second method is to put small metal plates on the surface of the concrete prior to coating at easy-to-find locations. If you have a non-ferrous gauge, you can use aluminum tape. You can then go back to these spots and use a regular dry film thickness gauge to read the coating thickness over the plates. For destructive methods, you can use a Tooke Gauge for coatings up to about 60 mils.

From massimiliano Lo Re of Studio mlr on July 13, 2012:
The question needs to specify if dry film or wet film thickness is being verified.  The topography valley of concrete substrate and its porosity must also be considered.

From Kishore Kumar K R of Nukote on October 13, 2011:
Because of air in the film, the ultrasonic gauge will not give you a proper/accurate measurement. For non-destructive measurement, use the machine strokes reading and thereby the volume for a fixed or pre-measured area. Use a digital vernier to measure.

From Mario Lefebvre of Polyval Coatings Inc on October 4, 2011:
     1) With an ultrasonic thickness gauge. 2) You can also estimate the thickness applied with the square feet + number of gallons applied. 3)You can cut a piece of the membrane, but it is a destructive test, so I try to avoid it.


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Tagged categories: Coating / Film thickness; Concrete; Concrete coatings and treatments; Polyurea


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