Well, you will want a finish with UV filters in it to protect the epoxy from degredation in sunlight. AFAIK, the West System epoxies can use pretty much any coatings over a properly prepared surface. (See their web page for appropriate prep for the epxoy you are using.)
The traditional overcoat is Spar Varnish and there are also some Spar Urethanes out there. There are a wide variety to choose from. Some popular (But not all cheap...) ones include Epifanes, Interlux, then there's Pettit, McCloskey's, Behr, Z-Spar, Helmsman, etc... I think you get the idea. There are champions who will swear by all of the above. Some people even prefer 2-part concoctions of things like urethane that are more difficult to apply and probably not necessary.
For a stripper that will be stored in the garage and gets regular, but not really hard use, pretty much any of the above should work with your West System epoxy. Do a good job wet sanding, clear the dust off the boat, apply the varnish in thin layers with a good brush (or foam brush) in as dust-free an area as you can muster with good light. Avoid contaminating the hull with any sorts of oils before coating and between coats. (airborne, from your hands, etc...)
The thing most people tend to do is to rush the boat to water as soon as the last coat dries. If you let it sit for a bit (say, a week or so at about 70° F or better, it continues to cure and get a bit harder.