Don Stephan
Posts: 825
Joined: 2003-07-18
Location: Cincinnati, Ohio
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Are you going to be joining edges of the veneer? If so, and it's too wavy to pull together tight seams, it needs to be flattened. If pressing on a piece of 3/4" plywood placed on a sheet of the veneer yields crackling sounds, it needs to be flattened.
Flattening is one of the easiest procedures involved with veneer, it just takes some regular attention the first couple days changing paper. If you have a vacuum press, use it to "clamp" the wetted veneer; if not, 3/4" plywood and cauls and clamps will do the trick. Just don't rush the drying process. If clamping without a vacuum press, don't be afraid to give it 6 or 7 days instead of 3 with daily or even twice daily changes of paper to become fully dry.
If in doubt, flatten.
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