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The gelcoat thickness is usually measured in "mils". Too thick it will crack, too thin it will have porosity/see through. Typically, I believe gelcoat manufacturers recommend 15-20 mils. Also, they quite often will spray a white gel coat(15-20mils) and then back it up with another dark colored gelcoat (10mils).
Typically you would wash the hull then clean/wax in some combination.
It's can be applied with a buffer running slow and keep it moving.
Stay away from automotive compounds and use "light" duty compounds, but only when necessary.
Meguiars make a good cleaner/wax (Boat/US or BoaterWorld)the is not very abrasive which is good to use year to year.
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