I would still attach the replacement piece to the scrap backer board with sheetrock screws before taping and mudding. Also if wall is textured you will have to roughly sand texture off the area where the mudding will extend to get a good smooth matching patch. An alternative to sandpaper in some areas is to use a damp rag(wring almost dry) to smooth the dried compound. This is particularly handy in feathering places where the mudding is lapping over or is very near textured areas. If it is a simple spatter pattern texture(like "orange peel"), the existing texture can be matched approximately using a a spray can of texture available from building supply stores. These cans have different size spray "straws" to adjust the texture. Matching is tricky though, practice with the spray can on a large piece of cardboard before tackling the wall. Also use drop cloths because there are inva
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These are good guidelines and show a good understanding of how to train a dog. Murphy looks pretty happy!
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