many years back now when I was doing some time in the workshops of the first company I worked for, we used to use a two part epoxy paint (was it trimite?) to paint everything on the shutdown units we made for big pumps, I remember clambering round the structures with a tin of paint and a brush and told I had to finish the tin within the hour as then it would set solid, so off I toddled, hand painting all the bolt heads, and the flange edges as well as anything that didnt move fast enough. by the next day the paint was almost indestructible, and certainly had a good finish considering it was all hand brushed on. but then it probably wasnt going to be subject to as critical an inspection as a boat hull would be.