Don Stephan
Posts: 825
Joined: 2003-07-18
Location: Cincinnati, Ohio
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Dean:
Your question seemingly deals with "veneered" MDF so the wrinkling could be either inherent in the surface of the MDF, which I've never seen, or in the layer of glue under the veneer. The latter could result from not using a clamping caul at least 1/4" thick over the veneer. Another possible cause might be too much time between laying the veneer in the adhesive and applying clamping pressure, allowing the adhesive to "grab" the veneer too tightly before clamping pressure was applied through a caul. If the adhesive was contact cement and the veneer was exposed to heavy coat of lacquer thinner early in the finishing process, the thinner may soften the contact adhesive and allow the veneer to shift, but don't know if this would cause regular wrinkling.
I HAVE seen on one board ten years ago a 3/4" particle core plywood that had a slight wave in the surface.
Unless you've seen plain MDF that has surface ripples, I'd first suspect the veneering process for introducing a ripple.
Just my two cents.
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