Clean it thoroughly and usid liquid metal (JB Weld??) to reinforce that spot.
Agreed, clean & JB weld it & put some scotch tape on it & invert it & let it dry so the mud will settle evenly flush with the sealing flange.Agreed. Do some minor grinding or roughing up of the surface, clean it off thoroughly and epoxy it back to its original shape/contour. Good luck.