Trailer paint

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I'm building a HOLY GRAIL trailer (no leaf springs) and need to paint it. I plan on painting the underside with a durable undercoating paint and the top side with a colored automotive paint. The question here is what is a good bare metal underside paint for trailers? It has to be paint. Not doing anything rubberized as it will tear and hold moisture and rust.

 

[4Waters]

Por15 used to be the shit, IDK if there is something better now

 

[mash on it]

I've used this for several boat trailers.

https://www.tractorsupply.com/tsc/product/majic-tractor-truck-implement-oil-base-enamel-gloss-white-1-gal

But I used primer first.
Did one in 2007, still shines.

Dan'l

 

[wzuber]

2 component Epoxy primer (industrial or automotive) will be your best product overall for impact and rust resistance. Abrate or sandblast metal to achieve best adhesion perf. Etc and make certain surgace is free of oils or contaminants just prior to applying. Protect surroundings from overspray if it can drift and cause an issue.

 

[Happy Smitty]

I know you said no rubberized but flex seal works for me on my toybox undercarriage. I recoat it every year and it still floats evey time I back it down the launch ramp.

 

[BUDMAN]

What ever happened to good old Imron single stage paint. Damn that shit was durable