Maguires#16 if you can fine it. It's a paste wax I've used several times after wet sanding and compounding. Lasts a whole summer. Lots of easier to use liquid waxes out there like Colinite insulator wax, but this paste wax simply lasts longer.

I have used everything, but for an all around wax, Waxing Frenzy is hard to beat.

Hey Chris, I ordered two applicator pads... Just in case you stop by.

I personally like Waxing Frezy. Easy on and easier off. Works better than anything else I have tried. The other products they have are also excellent, washnwax, shark Tower for metal surfaces and I also like the degreaser and leather cleaner and conditioner. Nice people to deal with too.

I have never waxed my hull below the water line. I clean the crap out of it but never wax it

Waxing Frenzy
Also try Rejex. Lasts forever on my work truck.
Just waxed boat with it - great shine. See if it keeps any of the scum line off of it.

I've been told gas, and soap like 'dawn' will strip most waxes, so watch what you wash your boat with after you wax.

http://hammerheadboatworks.com/frenzy_wash_wax.html

I gave away all my other brand soap and will only use the Frenzy wash and wax! This stuff is loaded with wax, thick soft soap that works and even smells good! Obviously I like it

I use the Spray wax when we pull the boat just as a follow up detailer and of course the Frenzy wax twice a year. These products all work well and are easy On/Off. Just my experience from trying all the "Best" products out there.