As pictured below, I have a 4" x 6" rectangular hole in my drywall, which I cut using a jab saw. I plan to patch with the original drywall piece that I cutout, with a couple of furring strips behind. (They are 0.75" x 1.5".)
Do I need to use drywall tape, or could I get away with just using the drywall mud?
Will I need the standard 3 coats of mud? And the wider knives? (I only have a 2" now.)
How do I avoid bumps from the patch (i.e. tape & drywall mud raised on the wall)?
What would happen if I just used the furring strips, and filled the gaps with spackle?
Anything else I should be asking?