I did a 18' aluminum boat a couple years ago. Takes alot of cleaning,(dirt, carpet glue etc.) mainly used a wire wheel on a 4" grinder to clean & rough it up so it will adhere. Bought the spray in liner that could be tinted, tinted it light grey, came out really good, sold the boat, the guy that owns it now hasn't had a problem with it & it's been about 4 years. The spray gun came with the liner.
Call around to autopaint distributors, some will carry a spray "tintable" liner.
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