I have used Belzona on many occasions repairing blast areas of guided missile launchers. this is what we used to fill in between the ablative tiles that protect the deck and blast doors and plenums its quite a job to cut out and replace after a shot. getting the bottom of the pits clean enough to make a good bond will be challenging . The Navy uses Belzona to reline centrifugal pumps when pitting becomes a problem. good luck and I am looking forward to see your results