Got a painted boat trailer I’ll be doing son rot repairs to and I’ll be looking at painting the whole thing once done so need a good rust resistant hard wering paint for it
2 part marine epoxy. If its good enough for barges and oil rigs should do a boat trailer fine. Something like Sigmacover 456HS or Sigmashield 880 would be good.
Leighs 922 or Jotun 90.
Jotun 90 is probably the cheapest option.
Remember to ideally sandblast first although a rough keyed surface will do.
Search on here for Jotun 87 - Jotun 90 has replaced it.
Get one with aluminium in it.
Ideally you want an acrylic or pu topcoat - something like hardtop XP. Not essential but epoxy will chalk in sunlight - only a visual problem.
A high solids, 2 pack epoxy containing micronised glass flake and anti corrosive pigments suitable for use on blast cleaned and cathodically protected steel.
www.promain.co.uk
You can also get a good 2 pack epoxy in an aerosol