I got a gallon and a half with the Pygmy Arctic Tern 14. Using 6 oz. glass outside of deck and hull and just bottom of hull on inside I used just over a gallon. Sounds like about your use if you double the glass on the outside. I'd get a gallon+. I guess this means 1 1/2 for Dystem 3 or Raka.

: I am working on gathering supplies for a stitch and glue kayak and
: need to know how much resin and hardener I may need. 14 foot
: boat. This is my first attempt and want to have enough material
: but not a lot of waste. Thanks