Metal prep question

[WildBillyT]

So I've got some parts that look like this, with the pitting and little rust spots:



I'm using PPG's stuff for the paint job (DP90LF, K36, Deltron, etc) and media blasting is kind of out of the question. I am planning on using DX579/DX520 metal cleaner and conditioner on panels like this to neutralize/remove/convert the rust down in the tiny pits.

Kind of just looking for peace of mind here, since it's amateur hour and I don't want to have adhesion problems with the epoxy.

Is this an appropriate situation to use DX579/DX520 or do I need to go with another method of dealing with the rust? I don't think going harder with a DA sander will work and using a clean-n-strip disc won't really do it.

Has anybody out there used acid treatments for removing/neutralizing rust in a paint job?

[The_Bishop]

You could try Naval Jelly to remove the rust in the pits, then a good wash afterwards to neutralize, followed by the DX579/DX520. I'd contact PPG to make sure this will work well before priming. Epoxy primer?

[WildBillyT]

Originally Posted by The_Bishop

You could try Naval Jelly to remove the rust in the pits, then a good wash afterwards to neutralize, followed by the DX579/DX520. I'd contact PPG to make sure this will work well before priming. Epoxy primer?

Yeah, DP90LF. PPG's sheets list it as appropriate after the 579/520.

I may drag out one of the panels I'm scrapping and try the Naval Jelly on that.

[PolarBear]

Use something like Ospho, it's pretty nice to work with and I am using it under DP90LF too. You just clean the panel, wet it with Ospho and wait 24 hours. It kills the rust and leaves iron phosphate, then you spray over it. If you're only doing a little bit I can give you some. I've bought 3 gallons for all my projects

[WildBillyT]

Originally Posted by PolarBear

Use something like Ospho, it's pretty nice to work with and I am using it under DP90LF too. You just clean the panel, wet it with Ospho and wait 24 hours. It kills the rust and leaves iron phosphate, then you spray over it. If you're only doing a little bit I can give you some. I've bought 3 gallons for all my projects

Thanks man.

I've heard DX, Naval Jelly, OSPHO, Picklex, straight muriatic... a lot of options.

Ospho is pretty cheap from what I remember. I just can't afford to have to do this twice. LOL.

[vcamaro42769]

hit it with a sand blaster...for a couple of seconds .., but epoxy primer will stick to rust i I never do it ... U are by the spingwheel bring it over I can hit it for u

[The_Bishop]

Ospho and Naval Jelly are very similar, the main difference being the consistency of it.

[sweetbmxrider]

I got my ospho from amazon. Its not amazing on heavier rust but should be good for this stuff, in my experience.