I had a neat old slice of a grape vine trunk about 8" in diameter. The wifey said it would make a good trivet for the kitchen. It was so thin I glued it to a 1/4" piece of plywood and gave it 3 coats of polyurethane which really made the grain pop. All our other store-bought trivets are natural wood. Looks great but now I'm wondering what will happen when a hot pot of food is set on it? Will poly stand up to this sort of heat? Randy