Have you considered using a two part catalyst cured urethane paint? I painted an old beat up aluminum trailer that I had a small boat on,with Epifanes Two part urethane,and it held up unbelievably well after trailering it all over the place,and a lot of them were gravel back roads.
For around $40 to $50 bucks for a quart it's worth a try. I would think any of these two part urethanes,form mfg's like Interlux,Signature,etc would do the job pretty well.The Epifanes is well known for their varnishes but their two part urethane is a very nice paint,and a hidden gem in their product line.
It's somewhat closer to Imron in it's make up.A foam roller(like one of the hot dog ones) would do the application nicely.
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All this,just for a boat ride
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