that would be a "patch" why not do it right the first time ?
Lift the floor, expose the damaged area, block the outside, rpair the damage from the inside, thats the Only way to make it look right and be structuraly strong.
You need to remove All the water "moisture" that entered the hull, if you don't do that, you will be in for a Lot more work when the job is done right, don't take any short cuts just to save a few bucks, will cost you more next year, or break your boat, it needs to be repaired from the inside, anything less than that is just a patch to make it float. just my two cents.