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Well John here is one
There are huge discussions on Wetcanvas, Cennini and Cowdisley. There are dozens of articles in books and magazines as well. As usual, I'm not making this stuff up. I don't even want to argue. I'm just afraid some artists that reads only this only get themselves into trouble.
As for the testing - it's very easy to do. Take 4' x 24' strips of all these materials and secure them over a span and start stacking bricks onto them. Take more standardized panels (all the same size) and paint them on one side. All the tests we can do have been done by hundreds of others before us. It's to their experiences and testing that I prefer to look. John is but one more of these.
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