Boat lifts and dock coatings The toughest problem when working around saltwater is rust. Proper prepping includes grinding and sanding off of the existing rust, then coating areas using macro-poxy to seal these areas. Then finish using Sher-Cryl for a hard lasting finish. Decks are pressure washed and then coated using a number differing products like Woodscape on wood, or H&C concrete stain for concrete.