There is a page, on another kayak site, which contains some info about testing various epoxies and varnishes for clarity. I hope this info is useful to you.

http://www.oneoceankayaks.com/Epoxtest.htm

Additionally, I have seen several posts on here desribing how clear the new System Three Silvertip epoxy is. Several builders have stated they feel it is clearer than others they have used....

: Thinking about staining the next build. Is Solar Lux a good stain to use? I
: was favoring Blue Sea.

: Kim