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Sounds to me like your test was similar to the same thing as HDU here. Makes a very fine dust that sticks to everything even with dust collection. And the outcome is the same as in your pictures. Needs to have a sealer placed over it then painted or textured and finished.
That called a Babysitter or a 3 in 1 available here http://www.thewinfieldcollection.com/di ... 00&catid=2