Rear driver control arm already rusting?

[biggdave92]

Rear driver control arm. Already rusting. What's up with the black paint?

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[NFRs2000NYC]

That's not rust, it's silica from the welds.

 

[WranglerWillys]

Silica aka glass doesn't work with electrical coating applications.

The part has to be free of rust, silica, grease etc for it to work.

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