Paint to stop rust?

So I received my bare metal sliders ~3 months ago. I followed some advice/guides and cleaned them and painted them with Rustoleum primer and flatblack paint. Not sure if I did a shit job or picked wrong stuff but they are starting to rust in multiple spots now. For now I plan to just do a little sanding and touch up the spots with the paint I still have, but want to figure out what I'm doing wrong to help prevent it in the future.

TLDR:
Looking for advice on what to use / do to best prevent rust. I'll note I do live near the coast so I'm sure that doesn't help.

 

If there is rust coming up from under the paint then two things could of happened.

1: there was some rust that was already starting that didnt not get cleaned up enough.
2: the paint you sprayed on was too thin and allowed water to get past the paint.


You will want to clean the rusty areas, spray with a self etching primer, and then repaint. Put the paint on a little heavier. You can always sand down drips in the paint if you need to.

 

I agree with /\

What I also did prior to painting was pressure wash the sliders and let thoroughly dry for a day or 2. Then I started with primer coats. I think I sprayed at keast 4 coats of primer and then 4 coats of black. I sprayed fairly light each time and it gradually built up the thickness to where I wanted it.

 

I'd use rust encapsulator for my base coat, then finish with a textured product.

www.monstaliner.com sells both.

Or you can use POR 15 as your encapsulator and Krylon / Rustoleum as your color coat.

Just remember if you use as intended, they are going to get the finish broken and need your attention. Thats why I'd use Monstaliner, as it's much harder to scrape (barring direct rock/concrete contact)