Re: Bottom repair while in the water.
You are probably best to have the boat pulled so you can inspect the bottom. If there is more than one spot of damage you dont want to miss any. Plus you will be able to sand the bottom in the area of the damage, apply a two part epoxy, re-sand, apply a barrier protection primer, and then reapply some bottom paint if you use it. The barrier primer is the most important, it will keep the hull from slowly becoming saturated over time with water. Then you will have a real problem.
You should be able to do this yourself over a day or two (drying times). The most expensive part will be the haulout and launch depending on the size of the boat.
Hope this helps.
Charles W. Spangler, Captain, USCG Master
Home Port: Chesapeake Bay, Middle River, MD.