philpac33,

I'm not sure if the kit will work. If the boat is a production model and not someone's garage built, the fiberglass resin was probably polyester. The paint you're seeing is probably gel coat. You'll want to take the gel coat completely off of the fiberglass, maybe a few inches either side of the crack. Make sure you have a rough surface (used coarse grit sandpaper) and clean the area well with alcohol. Fiberlay, I'm sure has the mat and roving, the polyester, the catalyst and the gel coat. A rule of thumb is one ounce of resin per ounce of roving cloth. If you're using a 24oz cloth, 24 ounces of resin should cover one square foot, if you're using more, the glass will be brittle and and crack, if you use too little, the mat and roving will not have absorbed enough resin to utilize it's structural properties. If I remember right, it was a 5% mix of catalyst to resin, then if it begins to kick off, add a little acetone (small amount) to help keep it thin. Usually, for structure, you want to stagger and layer the laminate to allow for pliability and strength. If it's just cosmetic, you could probably get away with just a layer of mat, then roving, then mat without the stagger/layering. Cover it with a layer of gel coat to protect it from UV or water damage. These chemicals are all pretty caustic, so it's a great idea to wear a respirator and use gloves. Who knows what the cost of all that will be though, may be cheaper to just hire them to repair it.