Tape Adhesion ASTM D3359 [Paint Testing] 

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My pleasure.

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Thank you!

Just like in the video

You can use cross-cut test method for many hard and rigid substrates, not only metal.

ASTM D4541 pull-off test (for wood or steel substrates) and ASTM D7234 (concrete pull-off test) will always be more reliable. Cross-cut tests (tape adhesion) are just a simple checking test

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Generally it depends on the test area and the number of panels you have. It's different to how you prepare panels in the laboratory, different to how you have to perform a test on an element whose surface is limited, e.g. on a construction site or on panels after SST. It also depends on whether you have a good result, an evidently bad result or a moderate failure of the cross-cuts. If the result is clearly bad (100% failure) or clearly good (0% failure), it is enough to do 2-3 repetitions. If you have an intermediate result, you should do 5-8, and sometimes even 10 repetitions for adequate repeatability and precision.

Generally the method is to use it on a substrate that needs to be fairly stiff, but you'll have to try it to be sure.

All equipment is ASTM compliant. It's important to use standardized types of cutters.