As is often the case, your pictures didn't come through. There's instructions on adding pictures somewhere, but I've never had any luck with it. Without pictures, and probably even with pictures, it might be hard to figure out how bad the cracks are.
The very first thing I'd do is put the boat on the ground, preferably pavement. Start with lifting each hull separately by the bow, watching the crack very carefully. Does the crack(s) expend or contract? Have someone watching from the side and have them observe the hulls to see whether the hull doesn't lift evenly, both along the deck and the keel. If one hull lifts but the other hull does not, don't worry. It's an issue but only towards performance and some difference is common to most boats.
Stretch a string from the bow to the stern on the top of each hull, making it as tight as possible. Measure very carefully the drop from the string to the hull. Lift each hull by the bow and then from the stern. Measure very carefully the drop and see whether there is any change.
In both of these lifts, you can rest the bows on a block of wood while you're checking the crack(s). What we're looking for is whether the cracks are causing any flex in the hull. If there is any flex, I'd be extremely hesitant about trying to fix these hulls. This is a high load point on the hulls and if they break, you'll have the mast down and be sinking very quickly.
On the bright side, the cracks are probably confined to the gelcoat. Take a narrow blade such as a knife, and put into the cracks to see how deep they are. My guess is the blade will only go down maybe an eighth of an inch. Further checking would involve choosing one section (probably the worst area) and grind it out, going down to where the crack disappears. If you're lucky, you're not into the glass and all you've got is a gelcoat problem. Grind out the crack and patch with one of the many repair kits that are out there.
If the crack goes into the glass, then the problem is worse and more expertise is required to fix it. If the hull(s) are not flexing, it's doable, but experience helps. I'd find someone local who knows glass work to give you some advice after seeing it.
Jim Clark-Dawe
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