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I removed my rear bumper today and noticed that alot of rust has began appearing on the inside of the bumper. I removed most of it with a battery of wire brushing and sanding. How can I treat the inside of the bumper to ensure that it does not return. Is prime/paint an option given that the unaffected surface is chromed?
 

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This is VERY common. As soon as I got my new bumpers I primed and painted the backsides. I used body color, but black should work just as well. Since yours have already started, use some kind of rust killer first. then prime+paint.
It's easy enough to mask off the outside chrome. I leave the masking loose around the bolt holes. I hate those little "rust trail" from water trapped under the bolt head. I also use sealer under the bolt head to also help with this.
If you get some overspray, it cleans up easily with some 0000 steel wool. Be sure to use 0000 as it won't scratch the chrome.
 
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