If it is a solid glass built boat with no coreing and long as the stringers and transom are solid I would believe that you would be alright.I have seen quite a few cored snail boats where the balsa coring had became saturated and created soft weak areas and ultimately failure . I have also seen where older foam cored high performance snailboats boats have had their skins shear away from the coring,yet remain totally intact and unnoticable unless some were to do a inspection.If this happens you have a big problem.
Sorry for the snailboat reference but that is mostly where my experience of these failures lies.
I believe that lightly built older foam cored boats that have been subjected to repetetive amounts of very high stress have a limited shelf life and should be inspected with a cautious eye.
Just my 2cents.