Jburks:
An excellent wax is Meguiar's Flagship Premium Marine Wax in liquid form. For years, I had used one brand or another of paste wax, convinced that it was 'harder' or somehow longer-lasting. A friend who waxes his 80 ft, 2-deck houseboat each year suggested I try Meguiar's in the liquid instead. On a lark, I called Meguiar's factory and asked for technical service. One of their chemists picked up and told me that liquid and paste have essentially the same ingredients and after buffing out either, all that remains is a film a few microns thick with exactly the same final constitution. All the rest is thrown away as powder and rag dust. The can of paste wax contains more wax, but requires more effort to apply and is a bit more sensitive to temperature when applying and buffing out. The liquid doesn't go as far, but is much easier to apply, more forgiving and quicker to cover broad areas. I have to completely agree with him.
My earlier 37' fiver would cover in slightly less than one can of paste wax or a bit more than two bottles of liquid. But for endurance, there was no difference--about nine months of camping and three months under cover in the winter. Then another coat was necessary in the spring.
There are some new formulas I haven't tried yet, but I doubt that any will cover more than a year. UV, heat, rain, chemicals, wash cleaners, dust at 65 mph--it is amazing to me that the microns-thin coating can stand up as long as it does.
Regarding cost, it costs me a bit less than twice as much to apply liquid as paste, but I can wax my whole rig in a weekend where the paste took me a day or so longer.
--Rick