Jim,

After you get done with the 800 grit (wet), use 3M Rubbing Compound on a machine buffer to get the remaining light scratches out (do the whole hull while you're at it).

Follow up with 3M Finesse-It II polishing compound on a machine buffer with a foam pad. This is what really brings back the gloss.

Use a good boat wax to preserve the finish.

I did this on my 32 year old 14 and it looks like it just popped out of the mold.