Hey royaluser, I too have a Supercat 17, incredible little boat… the best thing you can do is go to http://aquarius-sail.com/default/
From there, go to the owners forum, then to the Technical Forum section. Post your problem in as much detail as possible. This is the forum hosted by the Builder of the Supercat and ARC catamarans. They know exactly what materials are in the boat, how they structurally work together, and how it needs to be repaired. Matt and Tom Haberman are very responsive…and don’t be surprised if the Supercat designer (Bill Roberts) doesn’t respond as well.

While you can get a lot of generic advice here on the Catsailor forum about repairing catamarans in general …a repair technique that has worked on a Hobie or Performance brand cat "may" not be satisfactory on your Supercat. The location of the crack you are talking about could become a very serious structural issue, and needs to be addressed before the boat is put into use.

You can get free expert repair advice right from the builder. Customer service is one of the many benefits of owning a Supercat/ARC catamaran. It doesn’t matter if you bought a new ARC catamaran last week or a 25 year old used Supercat from your local newspaper, they will support you with specific information and parts.


Personally (even with 39 years of experience in fiberglass/composites) I would not initiate any repair to my SC 17 before contacting Matt or Tom for their insight on the matter.
Each structure is different. …

Regards,
Bob