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Thanks, Julie. That's interesting. What I gather from this, is that it is possible water-soluble contaminants/colorants inherent in a canvas could come into solution when an acrylic, water-soluble ground is applied, which would present as discoloration, or variegated stains or watermarks in the painting ground. The sealer you recommended (GAC 100) is a product intended to "pre-prime" a suspect canvas before applying an acrylic painting ground, to prevent any such discoloration.
Going back several responses in this thread, I'd say that the best prevention for this fault would be, as noted, wash your raw fabrics before stretching and priming them! .
I don't think one need worry at all about anything on a wooden panel discoloring either pre-primed canvas (especially oil primed) or a finished painting, although the sealer could be useful to control the absorption of PVA or acrylic adhesives by a raw wooden panel. ?? In any case, it sure can't hurt anything . . .
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