Resurrecting this thread as I've just ordered a JB and looking for suggestions as to protection and care. I'd like to put something good on from the start! Buddy has a five year old AH Airtop and has just used car waxes and he's had some serious fading. His AH and my JB both reside/will reside outside.
From reading all the threads I could find here on care/maintenance of the fiberglass shells of JB, AH and others is to use a good quality marine polish for gelcoat finishes that'll provide UV protection. Seems like just about any marine polish will do. I've seen threads suggesting Meguiars 50, the 3M noted above, etc. There are too many products to research. Seems that some information suggests that after a good marine polish for gelcoat that any good auto wax or polish will then work to give it a good shine. One site suggested bees wax, but not carnuba as the later wouldn't last. I've used Zaino Bros show car polishes for years with superb results on my truck and cars. Zaino is not a wax, but rather a show car polish that doesn't contain abrasives.
I've got a West Marine close to home I'll probably visit and see what they carry and recommend. I live close to the Dana Point harbor so no lack of marine stores!