Self priming paint vs primer and paint

[6PTsocket]

I have an old CM hose cart that is all metal and except for some rust was in good shape. Metel carts can be expensive and the plastic ones don't last I just got the rust off the sheet metal and I am ready to paint. It looks like Rustoleum brushed nickle aerosol is about the right color. I have always used separate primer and paint but I see they offer the one step combo, too. Does anyone have any experience or basis for comparison? Paint technology keeps improving. Are we there yet? I would not go single step for convenience if I give up durability or rust resistance. Only hard proof or experience, please, not " I wouldn't trust it" This has been around a while in latex house paint but now I see it is in the alkyd aerosols as well. Thanks.



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[Dsel74]

I don’t know if either primer & paint or the two in one can go directly on metal without an etch primer.

When I tried skipping the etch primer on my drill press it chipped/flaked off.

I don’t really have an answer to your question but maybe have expanded the question.

 

[alwaysFlOoReD]

Subbed.
I've heard it called DTM = Direct To Metal.

 

[6PTsocket]

I don’t know if either primer & paint or the two in one can go directly on metal without an etch primer.

When I tried skipping the etch primer on my drill press it chipped/flaked off.

I don’t really have an answer to your question but maybe have expanded the question.

I have used phosphoric acid rust remover before priming and that leaves the surface etched. I think a media blasted surface is ready for primer, too. In either case, a good cleaning with something like Prepsall shold be the last step

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[The Cobbler]

I have found dtm (direct to metal) alkyd base paint quite good, if the surface is clean

 

[gofastwclass]

The only rattle bomb paint I've used on metal that seemed to have any longevity was Rust-Oleum. It seems to be more like single stage automotive paint in a can by how it covers and dries. A friend told me about on their epoxy paint that doesn't require primer several years ago and I'm hooked. Now I use it on all my paint tasks that are too small for mixed paint. I found it holds up extremely well under the hood and for chassis components.

I made some control arms for one of my custom cars and they are holding up great. I didn't prime the metal at all, I just cleaned the surfaces before painting two coats with a dry between them. When I pressure wash them off they still look almost new after three plus summers of driving.

I haven't used any in a place exposed to direct sunlight that I can remember so I can't comment on that application.

 

[fasteddie]

I would still use a primer. Either self etch or rusty metal primer if you still have some surface rust. I always thought those "paint and primer in one" paints were a scam. I've never seen the Rusto epoxy DTM, is it a two part mix in the can type thing?

 

[chaosracing]

I still use primer when painting on bare surfaces no matter what the material is. Pros still do it that way, and I do like old school ways so I will always use primer.
For the metal, get a self etching primer (they sell in rattle cans) and prime with that, then paint over it.

 

[RogueFab]

I have had great luck with rustoleum applied right on metal ONLY when it (the metal) is prepped with laquer thinner.