Saw this thick square of painted plywood in a boatyard. It was sitting on top of a jack stand and over most of the surface there were these areas where the paint had been scraped off and quite noticeable grooves left in the wood. It was probably used to support a boat's keel or transom and I'm guessing that the boat was slid over it and moved sideways periodically, but as I say that's just my guess.
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