I finished off the mantel with four clear coats of Minwax clear satin Plycrylic. I decided to go with lag bolts and metal brackets to hang the mantel. I had installed a header made from 2x8's and half inch plywood when framing the house, so I would have enough strength for whatever I decided to use for the mantel. I used 4 1/2 inch lags into the mantel and 3 1/2 inch lags into the header. It weighs somewhere around 100 pounds.
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Eddie