Is the boat an older model without a core, or is it one of "Catalina's" foam core editions? What is the hull number? Whether it is cored or not-cored makes a final difference, because you are not faced with just lamination; core replacement will require a more lengthy and detailed retro.

Remove the entire deck because if you don't they become a pain to seal properly. Be careful as those deck plates are very rare.

As a former NACRA dealer, I wish you the best,

Bert Rice
Nacra 5.2 and 5.5 SL (retired)