How to Fix Bowing Wood Slab

Remove the wood slab from the structure or furniture so you can straighten it properly.

Strip any finish such as paint, stain or varnish with a wood stripper or a refinishing product. Many wood slabs are unfinished and don't require this step.

Set the bowed or convex side face down over a heating vent or other source of heat. A radiator or an electric heating pad are other options. If you do not have a gentle heat source, place the wood slab so that the concave side -- the part shaped like the inside of a bowl -- receives direct sunlight to warm it.

Wet a towel with hot water and wring it out.

Lay the warm, damp towel on the concave side.

Set heavy objects on top of the damp towel, such heavy books, bricks or large stones.

Replace the damp towel at least once a day and put the heavy objects back in place. Do this for five or six days or until the wood slab straightens.

Clamp the wood slab with C-clamps onto another slab or a flat object such as an old door. Set small wood blocks between the slab and clamp. Place other clamps on the slab every 12 inches or less. This ensures the slab remains straight. Reposition the clamps about once a day to prevent indentions.

Stand the wood slab up while still in the clamps. Do this in a well-ventilated area where it can remain undisturbed for up to several weeks. Once the slab is thoroughly dry, remove the clamps to use the wood.