Lots of info on Sharkhide from past threads. Use the acid cleaner and follow it with a couple of coats of Sharkhide and you are good to go for several years.

I avoided the cleaner because I thought overspill would eat up the vynal covering on the side of the boat. Used 3M ALuminum clearner and took off the buffing compounds with some commercial window cleaner (Laquer Thinner is recommended for this, but back to the worry on the vynal).

Sharkhide applies easy.

Lot of work using the cleaner. I didn't do the bottom of the boat, but the sides and bow are holding up great, so far.