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To correct a cupped board, lay the concave side down in wet grass, in a sun

To correct a cupped board, lay the concave side down in wet grass, in a sun
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To correct a cupped board, lay the concave side down in wet grass, in a sunny spot. The sun hitting the convex surface will contract that side faster than the wet side. Watch the board closely; it could take 4 hours or as long as 4 days to undo the cupping.

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