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Now coat that board in polyurethane, otherwise it will get moldy from the wood drying out repeatedly. You don't have to but it will help.

I have a 3/8th" piece of Oak plywood 13.5 inch x 4 that I use to hone anywhere in my lap. For a sink bridge you can do the same thing, just cut a board to size, then cut grooves for water flow. You...