>But how would a thin coating of epoxy keep the top surface from expanding? I >don't know what the tensile strength of a thin coat of epoxy is, but I'd but >it's not much. Indeed, I do imagine that it would constrain the top of the >panel a bit, but seems hard to imagine it doing lots. But the top of the epoxied panel won't be under tension - ever, will it? It just won't absorb moisture and swell like it would without the epoxy, so, won't expand significantly. The panel isn't being passively bent by humidity absorption, remember, it's the initiating source. Ron N
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