Any fibreglasser should be able to deal with the issue. If your in Victoria the logical place to go to would be AMCAT in Bayswater.
Otherwise I would be looking at maybe a boat repairer. You need somebody who knows fibreglass and automotive painting.

I have never seen them crack in that position. Can you show us a photo?

Glad your enjoying your V Series Sandman. Would love to know more about it and view some images.