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I just read in the technical section of the current issue (November/Decenber I believe) of American Artist Magazine that IF you're using acrylic gesso, there is no need to size at all. In fact, the article seems to warn against it.
Further, I can tell you that it does not seem to lessen the absorption rate/problem with masonite-like boards. I've now tried it both ways, and it takes as much acrylic gesso with, or without sizing, which, to my mind, makes sizing just another step that is unnecessary in the first place.
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