How do I seal acidic adhesive?ApproveRejectUn-ApproveSubscribeUn-Unsubscribe
Question asked 2018-06-16 16:42:49 ...
Most recent comment 2018-06-19 09:08:41
I am creating a slate-veneer panel for oil painters using flexible slate veneer and aluminum composite material. Here are three photos:
The back of the slate veneer almost certainly has acidic adhesive to adhere a thin felt backing. (It's building material.) So, is it necessary to seal the back of the veneer with something like GAC 100 before adhering it to the substrate, or does adhering it seal it enough? I used Golden Soft Gel to adhere the slate to the ACM, and it worked very well. On the sample in the photos, I sealed the back of the veneer with two coats of GAC-100 before adhering it, but I'd like to skip that step, if the panel would still be satisfactory.
Thanks, Amanda Teicher, Seattle
Answers and Comments
The issue with acidic adhesives is that they can attack the organic
components used in easel painting (eg cellulose in fabric). This is not the
issue in the panels you are describing, so I would not worry about the acidity.
I would want to make sure that the existing layer would not
be a source of delamination overtime. Is the adhesive is both strong enough to
hold the veneer and that it has good aging properties assuring that the
adhesion will last over time? The reason I say this is that even if you coat it
with an acrylic dispersion, if the existing adhesive layer fails, there could
be delamination at that site anyway. In a laminate structure, each layer needs
to have the proper adhesive and cohesive properties. It is sort of like the
weakest link in a chain analogy.
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