I have done two sets of hulls with this tool:
http://www.harborfreight.com/cpi/ctaf/d ... mber=92623
You can sometimes get it on sale for $19. Use any of the liquid "Scratch-remover" polishes you can get at Wal-Mart. Get a good wool pad from HF or an autoparts store with the velcro on the back and it will make your hulls shiny.
I used the same thing on my airplane and it came out great. I got a mirror-like shine on 6061-T6 Aluminum after a little work.
http://www.cooknwithgas.com/Polishing.html
I used a product called NuVite on the airplane but it was more expensive than you need for the Hobie hulls. Just use a cheap scratch remover liquid and you will get great results.
Scott Laughlin
Omaha, Nebraska