Nida-core is a honeycomb panel and was purchased by 3M about 3 years ago. They just announced they were shutting down production because it's not making money
. It is very expensive compared to the other cores but is really light. Some people say it's not good for marine
applications but all the marine outlets sell it and it is specifically marketed for this and other applications. I think it was also used in the aviation industry.
Vinylester is a step up from polyester resin and a step down from epoxy
. It is stronger but more expensive and has some mixing and application issues. 99% of all boats made use mostly poly even though it's not waterproof. Many manufacturers use vinyl only below the waterline because it is more waterproof than polyester. They will then apply an epoxy
barrier coat and antifouling paint
for more waterproofness. They paint
the topsides with a 2 part (mostly) waterproof paint.
Almost no manufacturer uses epoxy because it is so expensive. It is strongest and the most waterproof of the 3.
I think the Kitkats were sold as kits in various configurations. Usually the structure was built at the factory.