I had bought a wakesurf board this winter and when I got it, it had a slight bb sized chip in the nose from shipping. I mixed up some fiberglass resin and filled it in. I decided while i had the resin mixed, I would fill in any cracks and knicks in my wakeboard as well.
One thing I found out is to try to make it as smooth as possible. It seems like it cured pretty good and hard, but I have little bumps on it now where I filled in and I have to sand down now. The spots I did flat and flush are good to go.
I'll see how it holds up this season.
My damage wasn't as bad as some of what was shown, but I'd definitely say it's worth a shot. I did the fiberglass because that's how the wakesurf board was constructed and figured it would be better than nothing on the wakeboard.