Holes ranging from 11/2 to 6 in. dia. must be bridged with an even stronger, more rigid material. We used a 4x4-in. galvanized-metal patch from Homax ($2.25) to repair a 2 1/2-in.-dia. puncture caused by a doorknob. The company also makes 656- ($3) and 8x8-in. ($4.25) patches. The patch comes stuck to a 6-in.-sq. piece of adhesive-backed fiberglass mesh. To install it, peel off the paper backing (photo 3) and press it to the wall centered over the hole. Then spread on three coats of compound, letting each dry thoroughly before applying the next (photo 4). The final coat should be at least 12 in. sq. so that the compound at the edges of the patch feathers out to the surrounding wall.
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