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Richard,
Thanks for the reminder about archival permanence. I was so focused on the fact that sign painters letter directly to the surface that I was overlooking this weightier issue.
Museum curators consider Dibond panels as archival and it fulfills all of my other criteria. Yet despite my searching, I have been unable to find any information concerning direct paint adhesion properties. I guess I will go with Golden's recommendations about applying a GAC100/gesso ground first.
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