Don Stephan
Posts: 825
Joined: 2003-07-18
Location: Cincinnati, Ohio
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Not sure how you are going to be able to flatten very wavy and brittle veneer if you don't apply liquid that will be absorbed into the veneer and make it flexible. I don't know if Unibond or epoxy would be absorbed fast enough to soften the veneer before the adhesive begins to cure.
The flattening process I'm familiar with involves surrounding the veneer with fiberglas screening after moistening (to keep paper from sticking to the veneer) and then pressing with several sheets of newsprint or similar paper on each side, changing the paper several times the first couple days and once a day thereafter until the veneer has dried. (After the first couple days, the screening is no longer needed.)
From experience, you don't want to allow the veneer to air dry, because it will simply become wavy again, even a couple days into the process. Keep changing paper daily and clamping until the veneer has completely dried. A vacuum bag might help draw off the moisture and save some time, but the paper is the primary drying agent.
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