I have what looks to be a half dozen stress cracks in the gelocoat lining in the bottom of the bilge. The cracks are any where from .5" to 2" generally located where the flat bottom curves upard to become the side of the bilge. I have read about the keel hull joint flexing, could this be the cause of these stress cracks? Has anyone ever seen this type of situation before? I am concerned, is this serious? I bought this boat 3 years ago as my first boat so have a lot to learn.