Keith Newton
Posts: 4
Joined: 2004-05-25
Location: Little Rock, Arkansas
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Doug I have done a fair amount of this kind of thing without any problems, but I would only use epoxy for the adhesive. If your substrate and your veneer are at EMC, you are not changing that. Anytime you are using a water-base adhesive, as soon as you start spreading that you are causing both substrate and veneers to expand, which starts a chain-reaction of events.
The veneer is free to expand more than the substrate, but the face of a solid wood core will almost certainly expand as soon as you add moisture, then as things start to dry, they start to contract until they reach EMC.
So the substrate may returne to its original shape if it were only water that was added, but the glue and the face veneer are wanting to contract to a much greater extent than the face of the substrate, so they are forevermore under tension relative to the substrate, which will make the panels warp relative to that tension, and that is why it is so important to keep a balanced panel under most circumstances.
Epoxy may cost a bit more, but there is no water, or any volitile substance which has to evoporate, so when it kicks the substrate, veneer, and glueline are still at EMC with no built in tension, and actually the epoxy is one of the best moisture-barriers on the market, which will keep the substrate from changing relative to humidity changes better than most finishes. That is why it is so popular for boat building. It can even be used under water for prolonged periods.
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