I've just had the transom on my boat reinforced with a stainless plate across the top 2 mounting bolts for the outboard across the inside of the hull.

The repairers mentioned there was some "rot" around where the bolts were and advised this was only a "patch" and should this be an issue in future, the best repair method would be to cut the transom out and put a new one in.

Are there any tests that can be carried out on fibreglass that can detect rot or weakness? We do Ultrasonic testing on steel at work and was wondering if there is any procedure for testing fibreglass in a similar fashion?

It would be good to know the extent of the cancer, if any before I was to go down that path.

Cheers for any advice.

Kearnsy