Supposedly it replaces the water in the cells of the wood for Dna. Theory is that because Dna dries at a more consistent rate that water, it helps reduce stress on the wood while drying. Some folks don't think this method works or works well enough to validate the expense. I have tried several different ways and this method is most consistent and rapid than the other drying methods I have used. I am testing another method but will have to get back to the group after a while.