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Look into Aluthane at Progressive epoxy .com $100/gallon.
The zinc paint is a waste of time. I bought a new galv. trailer years ago and sprayed every nut and bolt with an industrial zinc paint. Less than a year later it looked as if I had done nothing.
for little money, I have not used Aluthane but it seems like a good alternative

I agree with others that an aluminum or galvanized trailer should be in your future plans.