Metal patching materials made of aluminum or galvanized perforated metal have become popular in recent years. The advantage of these materials is that you can do a much quicker repair than if you square up the hole and splice in drywall.
Metal repair patches come in a variety of sizes from 4" x 4" to 8" x 8". Manufacturers are: Homax, Fibatape, Stanley, and others.
The downside of metal patch
The downside of the metal patch is that you have no drywall in that repair spot anymore. If you want to hang a picture or something else, you will have to find another spot to do so. I don't like using metal patch over through and through holes (without any backing - unlike a "dented" in "hole" where the dented in broken drywall can act as a backer) because you will have a "hollow" spot in the wall which will not have the benefits of drywall such as: sound deadening and fire resistance.
The upside of metal patch
Speed. If you have a small hole or a dented in drywall section, fill the hole with drywall compound and then place the patch over the dented in section to surface the repair. This will back fill the repair with joint compound so that you do not have a hollow repair.
Skim coat over the metal patch at least twice, allowing the compound to dry between coats. When the final coat is dry sand (see dust free sanding), prime and paint.
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