Drywall fixing techniques - Which to use and when?
I understand that there are several ways to fix drywall holes:
Bigger holes need a piece of drywall replaced and use 2x4 for back support. Use joint tape on the edges and use joint compound to affix it.
For smaller holes, use mesh (tape) and just use joint compound over it.
My question is what size the drywall hole should be, in order to choose one of the above methods? What should be a rule of thumb to decide?
If I use just a mesh tape with joint compound on top on my 4" x 4" hole, how sturdy would be the fix?