I work in a Marina environment and all of our berths have little aluminium plaques with the berth # placed on the edge of the jetty which have been coated in incralac about 10 years ago and still look great. All I've had to do is redo the numerals in 2-pac recently and was pleasantlly surprised that they didn't blister etc.i would say good stuff considering the environment facing straight up towards the sun for 10yrs+ next to saltwater and people walking on it. Disclaimer is I don't know how you'll go with it over fresh plating