There's a difference of opinion on this subject, as far as material selection and edge sealing goes. Personally, I would only use a non-air release vinyl on a boat wrap. Why, those tiny air channels provide a pathway for high speed high pressure water to enter under, and cause failure of, the wrap. It's not just a supposition-I have witnessed in personally. Controltac is not for boat wraps, folks! Would I seal the edge? I've done a lot of boat stuff, and I can say that at a minimum I would seal the leading edge and the waterline, with a 1/2" strip of the best cast material I can get my hands on, and I would heat set this stripe, too.
Please remember that boats are subjected to forces far greater than and more damaging to wraps than that of a car, truck or van.
If you want a customer to be satisfied with a $100 + a foot job, do it right the first time, cause the wrong materials on a boat wrap will haunt you for a long long time.