If things are REALLY chalky I recommend a direct drive polisher with a good wool wheel and a heavy cut compound, though the large wheel is only good for the large flat areas.
For the intricate and tight areas where you can not fit a wheel I start with with a DA buffer and a good 6" foam pad with a good finishing compound. For a DA unit I HIGHLY recommend the Porter Cable as well as a good quality pad. Here is the unit and pads I use. I buy all my pads from these guys and have always been very happy with their products.
This is a great starting kit and the one I got...
http://www.autogeek.net/porter-cable-7424-accessories.html
Here are the pads I use (Green, Yellow, White, and Grey). I reorder them as needed. On average I guess you would go through 2 green, 2 yellow, and 1 White and 1 Grey to complete your 17 restoration.
http://www.autogeek.net/lc-ccs-6inch-pads.html
When I do a complete gelcoat restore, I start with 3M Super Duty and go over the larger flat areas of the interior, top sides, and hull sides once really well. That first step is done with a direct drive polishing unit (Milwaukee) and the wool wheel. The super duty is really meant for this type of tool where the Imperial is actually meant more for DA buffers. You will likely have to source the super duty from an automotive paint supply where the imperial is more easily found. That said the super duty is cheaper and I get it by the gallon for about $60 where the imperial is at times double that. Personally I after using both, I think you get the same results with the super duty.
Then I move to 3M finesse it on the porter cable DA buffer and do 2 passes over the entire boat getting all of the nooks and crannies. After the compounding I do a couple coatings of a good mothers or meguiers wax applied by hand and removed with the DA polisher and finishing pad. I finish with Starbrite Marine Polish with PTFE polish applied and removed in the same manner for the glossy finish. After this so long as you keep up on your waxing / polishing you will likely not have to go back to the drastic heavy cut compounding and direct drive wool wheel.
Products:
Compound / Polish
http://www.amazon.com/s/ref=nb_sb_n...3M+Super+Duty+Rubbing+Compound+gallon&x=0&y=0
http://www.amazon.com/s/ref=nb_sb_n...e&field-keywords=3m+finesse-it+gallon&x=0&y=0
Wax Options
http://www.amazon.com/Mothers-Calif..._9?s=automotive&ie=UTF8&qid=1325024584&sr=1-9
http://www.autogeek.net/griots-best-car-wax.html
http://www.autogeek.net/fleetwax-870.html
http://www.amazon.com/Meguiars-G-70..._1?s=automotive&ie=UTF8&qid=1325024808&sr=1-1
Finish
http://www.amazon.com/Star-brite-Premium-Marine-Polish/dp/B002E9E1FA