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Old 02-25-2012, 12:16 AM   #1
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Prevent Bumper Rust?

I am starting to notice a little rust on my aftermarket bumper. Whats the best way to battle it? Is painting the bumper my only option?

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Old 02-25-2012, 02:00 AM   #2
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Yes, if you don't want to keep having to paint it forever.

Buy some POR-15 and POR-15 Metal Prep solution, paint brush and a couple rattle cans of primer and black rustoleum. Remove bumper. Take a 4" grinder and steel brush wheel and grind all lose paint off. Clean with Metal Prep solution. Brush on 2-3 coats of POR-15 on allow to dry. On last coat, let Por-15 dry for 45 minutes and spray an even and light dusting of primer onto surface(this allows primer/paint to "bond" with the POR-15). Allow to dry completely and come back and put a couple full coats of primer and follow up with 3 coats of Black. Your bumper will never rust again.
When a POR-15 painted metal surface(ie bumper) receives a rock chip, the surface rust from the small speck of exposed metal does not spread horizontally. So your bumper "appears" to never rust. It does in fact rust if the metal is exposed. It's just that the POR-15 does not allow the rust to spread into that cancer appearance that happens with a painted metal surface.

And POR-15 does not chip off the surface like normal paint will if you follow the instructions of "impregnating" the POR-15 with a dusting of primer 45 minutes after the last coat of POR-15 is applied.

Did my son's Rigidco bumper on his 93 XJ three years ago and it still looks like we just painted it. Except for a few "specks" of surface rock chips. But no rust.
We have sand and gravel on the highways in winter. So lots of chipped and cracked windshields here.
The more coats of POR-15 and primer/paint, the less likely the rocks can penetrate to metal. And even if they do it is usually a small speck and it just rusts to the size of the exposed surface and no more.

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Old 02-25-2012, 05:25 AM   #3
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Quote:
Originally Posted by 71K5 View Post
Yes, if you don't want to keep having to paint it forever.

Buy some POR-15 and POR-15 Metal Prep solution, paint brush and a couple rattle cans of primer and black rustoleum. Remove bumper. Take a 4" grinder and steel brush wheel and grind all lose paint off. Clean with Metal Prep solution. Brush on 2-3 coats of POR-15 on allow to dry. On last coat, let Por-15 dry for 45 minutes and spray an even and light dusting of primer onto surface(this allows primer/paint to "bond" with the POR-15). Allow to dry completely and come back and put a couple full coats of primer and follow up with 3 coats of Black. Your bumper will never rust again.
When a POR-15 painted metal surface(ie bumper) receives a rock chip, the surface rust from the small speck of exposed metal does not spread horizontally. So your bumper "appears" to never rust. It does in fact rust if the metal is exposed. It's just that the POR-15 does not allow the rust to spread into that cancer appearance that happens with a painted metal surface.

And POR-15 does not chip off the surface like normal paint will if you follow the instructions of "impregnating" the POR-15 with a dusting of primer 45 minutes after the last coat of POR-15 is applied.

Did my son's Rigidco bumper on his 93 XJ three years ago and it still looks like we just painted it. Except for a few "specks" of surface rock chips. But no rust.
We have sand and gravel on the highways in winter. So lots of chipped and cracked windshields here.
The more coats of POR-15 and primer/paint, the less likely the rocks can penetrate to metal. And even if they do it is usually a small speck and it just rusts to the size of the exposed surface and no more.
Almost sticky-worthy right there.
NOTED, with thanks!
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Old 02-25-2012, 07:37 AM   #4
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Yup, that's good stuff, 71K5. I recently trimmed my pinch seams, and gave the exposed metal several coats of JB Weld, followed by Rustoleum Stops Rust and Black Enamel.

If that combo doesn't look like it's gonna do the job long-term, I'll sand it off and attack it with the POR-15.

Thanks for the info!
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Old 02-26-2012, 01:38 AM   #5
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Glad to help.
POR-15 is the only thing I have found that stops the rock chip rust from spreading under the adjacent paint and giving your vehicle/bumper that "rust bucket" look.
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Old 07-31-2012, 03:49 PM   #6
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pre-treating an after market bumper?

I stumbled across this thread while doing a search for preventing rusty bumpers. I have a 2001 toyota 4runner that is in great shape except for the bumper it is horribly rusted. This bumper is very expensive and has several pieces that have to be bought. I got a quote for $1200 installed using aftermarket material. I was thinking of trying to change it myself.

I was wondering, if I bought the primed (black) or "raw" aftermarket parts, could they be pre-treated using your rust proofing method mentioned above? Would that last a long time? (I was thinking since the stuff was new that I wouldn't even sand it, I would just apply the solution and paint as you descibed above) I dont need it to have the pretty chrome look I just dont want the truck looking like its a rust bucket.
Thanks for your advice!
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Old 07-31-2012, 03:54 PM   #7
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great info 71K5, thanks for sharin
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Old 08-01-2012, 10:49 AM   #8
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Or, if you are lazy -- and not saying your are -- you could rub some WD40 on it every once and a while.

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