To give it a mirror finish, after sanding
to 1500 Grit, get a good buffer - not a cheap
piece of crap. Go to an auto paint
supply store and they sell buffing compounds in 3 degrees of courseness. Buy all three. Use the coursest one first with the wool buffing pad. Then use the medium liquid with a foam buffing pad and then the finest liquid with the foam buffing pad. While you are buffing, it would be much easier if you had someone with a squirt bottle squirting water
on the surface as you are bufing. This acts as a lubricant. They actually make a lubricating soap for this purpose. Buy it if they have it.
If you sanded properly, there is no need to make more than 2 passes with each buffing compound.
After sanding, the actual process should not take more than about 10 minutes on an average boat
size table. This includes washing/rinsing between coats and clean-up.