-- Last Updated: Dec-25-12 7:48 PM EST --
...not repairing them. Spider cracks occur in areas where the boat flexes. Repairing them doesn't change that and they are likely to reappear in the same places again. You could end up spending a lot of money for nothing. While spider cracks can be unsightly, they are purely cosmetic and repairing them is not mandatory for the longevity of your boat.