geoffhazel

That had to be the most useless video I've ever seen on Fine Homebuilder's site.

Caulk it. Use 100% acrylic paint. Use two coats if you have to.

When I need to fill the bottom, I've found that sometimes the facing on the block you just cut out will detach from the block with a little encouragement from a chisel, or if need be, run it through the tablesaw to remove the facing or veneer. I'll also skip the brad nailer, and throw a couple of clamps on that glued in piece. That way you avoid getting the nailer/compressor out -- and hey, it was glued in before, wasn't it?

For small holes that don't need any backing like a doorknob push-through, I've taken a piece of drywall about 3" oversize in all directions, draw the hole on the back and score around it, then crack and peel the core off the front paper. Butter the edges and paper with drywall compound, insert in hole atand feather. The patch usually winds up a tiny bit lower than the surrounding wall but that fills in nicely on the 2nd coat.

Saves time cutting a piece of backing and installling it and fiddling with small pieces of paper tape or mesh.