As my boat (also a Bav 30) wasn't hauled out for the first time until she was four years old, there was understandably rust on the keel. Each time I have hauled out in my ownership, I have found some rust has come back. I scrape/abrade back to bare metal where necessary, apply Jenolite, then underwater primer, then antifoul. In my heart I would love to strip the entire keel back to bare metal and epoxy it, but life's too short. I'd rather go sailing.