Starting to think about the Cap Rail (Toe Rail, gunwale). It will not be teak. Two reasons,
I know it can be epoxied and painted but at some stage that will have to be redone. That also sort of defects the idea of using teak in the first place.
I've looked at Plasteak lumber and it is promising but then came across this;
Ameriteak Marine Toe Rails - Gunnels
So far it look very good. I have installed a section and will play with it for a while