Above is a hole being opened between 2 metal studs to repair a crack in the wall . 5/8th fire-code drywall is removed,and replaced with new
5/8th fire code drywall . The fiberglass mesh tape is applied to the seams created where the new drywall patch meets the older existing drywall
wall surface . 3 coats of joint compound are then thinly applied over this fiberglass mesh tape . That is then sanded down sooth to blend in with older
drywall surface and primed and painted to match the existing older paint work over drywall .
Below are pictures of the finished product.