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Richard, I don't know a lot about all this, so I'm just following advice I've read and being extra cautious.
According to the Amien site:
GAC 100 is an acrylic dispersion medium developed to prevent SID ("Support-Induced Discoloration), wherein the application of an acrylic dispersion ground -- around 50% water at the outset -- can dissolve organic materials in the fabric support and cause them to migrate into the drying ground and discolor it.
So I got it backwards: it's not from the wood to the canvas, but vice versa.
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