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Any tips on how to treat pitted metal on the body before painting epoxy?
I have a few bigger areas(shown) but also a lot of areas with tiny spots…just want to treat it all.
I’ve heard good and bad about Ospho and other rust converters…Any tips?
thanks.
The top pic shows a spot I'd treat with the traditional materials. I use PPGs DX579 followed by DX520 (or DX501).
The rust pits are different. If you use the above method it's possible to trap the chemicals in the pits which is not good. The best way to deal with pits (and the only way to get all the rust out) is with some kind of media blasting. I use sand.
Once blasted and the rust is completely gone the metal can't get any cleaner, and no metal treatment is required. Just epoxy prime, let dry and then fill them.
The top pic shows a spot I'd treat with the traditional materials. I use PPGs DX579 followed by DX520 (or DX501).
The rust pits are different. If you use the above method it's possible to trap the chemicals in the pits which is not good. The best way to deal with pits (and the only way to get all the rust out) is with some kind of media blasting. I use sand.
Once blasted and the rust is completely gone the metal can't get any cleaner, and no metal treatment is required. Just epoxy prime, let dry and then fill them.
Good luck
This is solid advice.
Ospho, as another comment mentioned, does work relatively well in a pinch, but epoxy on clean bare steel is always best. You can get a hopper style sandblast gun at harbor freight for less than $20. It's handy to have around for lots of little jobs.
I got a portable unit from Harbor for less that 40 bucks.
happy with it…but it used a helluva lotta sand to get it all done.
But I feel much better about it now.
I got a portable unit from Harbor for less that 40 bucks.
happy with it…but it used a helluva lotta sand to get it all done.
But I feel much better about it now.
I’ll probably treat it as well.
Looks good. I wouldn’t treat it with anything. That’s a good clean blank slate to get some epoxy primer on before flash rust sets in. Wipe it with prep cleaner or acetone and shoot it. Then do whatever bodywork you need to do after that. If you wanna take it one step further, I’d pull that glass.
In the future you can take a clean shop vac and hold it opposite your blaster to recapture most of the media for re-use.
February 26th, 2023, 09:22 AM
