This is the area where many contractors can get into trouble. These are systems that require specific training and equipment to apply. It may fire retardant intumescent coatings or high heat, Teflon or polyurea. If it is a specific application you need a contractor who is capable. Toronto Industrial Painting is that contractor. This digester is being stripped of its old coating in preparation for the new. A high solids immersion grade epoxy is sprayed below the water line. (red coating) The gray is an epoxy top coated with a polyurethane to protect it from harmful UV.