Doesn't Sharkhide seal the finish once it's clean?

I use metalwax available on the web, site is same name, to clean the metal.

It's non-abrasive. The cleaner you apply then wax off. Pulls the stains out of the metal great and makes it look new again. Their wax protects but not as long as I'd like. I'm in the salt a lot and the wax protection is lasting only a couple months.