My first bass boat was an older one. After using for a while, I kept noticing that water was coming in somewhere. I looked and looked and couldn't see it while it was on the trailer. One day while swimming and feeling around on the hull, I found two screws sticking out that I hadn't been able to see due to the trailer bunks. The goof ball that had the boat before me apparently used some screws that were way too long to screw down the battery box.....so I had to take those out and patch the holes. I used the Bond-o Marine Fiberglass repair stuff and it never leaked again in the 7 years that I owned it.

I can't remember which Bond-o product I bought, but it did not have the glass matt with it - the fibers were already in it. All I had to do was mix it up, roll it into a ball, shove what I could in the hole and then spread out the extra around the hole to make it stick. It was a gray color, which was the color of my hull anyways.