> Can someones say what they are currently using to seal / finish > soundboards and what the pros & cons of this, or any other materials > might be? Lacquer, two or three relatively thin coats. > Is the expectation that the finish will reduce the seasonal > moisture exchange? No, but it slows it up some. >Does the nature of the particular material or the > thickness of application affect the board's physical / tonal function? Only if it's too soft and thick. Typically, finish isn't a major component of tonal response in soundboards. It mostly slows moisture passage, and keeps dust out of the wood. Ron N
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