I did a lot of research on painting tubes ....... long story but outcome was as follows
Most wear off pretty quick one manufacture does not but its not available readily on market as it was originally manufactured in NZ for spraying curtain sides of lorries.
as my company buys bucket loads of marine paint I got donated paint and thinners as part of a deal and sprayed up my avon 4m as tubes were tired it was cream (dirty white) sprayed black. 2 years on I gave a couple of areas a quick touch up but had been left in the water and abused for 2 years and was amazed at how good this paint was
it starts off life clear you can pigment it with any colour (polyester pigment)
Best bit is that I used about 3 litres to paint the whole boat with 3 coats and I have about 17l left. more than happy to donate if you would like to use as I will never use this much in my life time and only came in 25l drums.
few pics to follow - was very shiny to start but did dull down