M.B.
Gosh, it has been so long since I had a turtle but there is stuff for their shells. Go to a reptile and amphibian store. I know there is one in North San Jose off main street near the great mall I think but the guys in there know so much about reptiles etc. if you can't find a vet. My water turtle once got really damaged and they helped me nurse him back to health. Sorry I couldn't help more. Good luck!!