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Old 07-15-2017, 09:10 AM   #1
04blobeyebae
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Default How to remove HEAVY carbon build up on bumper from catless exhaust.

I purchased my STi like this and its pretty heavy and looks like it hasnt been cleaned in a while. Anyone know how i can get rid if this??

Ive tried clay baring and ultimate compound but nothing previals
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Old 07-15-2017, 12:22 PM   #2
That_Boosted_Life
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2016 WRX Premium
Lapis Blue Pearl

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are you sure it's carbon buildup and not burning of the paint? I know that depending on how the exhaust is oriented and how frequent flames or WOT pulls are done the bumper plastic and possibly the paint can burn from the amount of heat.
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Old 07-16-2017, 08:28 AM   #3
HCAutoDetail
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I agree, could be heat discoloration. Ultimate Compound should have done the trick.
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Old 07-16-2017, 11:59 AM   #4
04blobeyebae
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Quote:
Originally Posted by HCAutoDetail View Post
I agree, could be heat discoloration. Ultimate Compound should have done the trick.
Quote:
Originally Posted by That_Boosted_Life View Post
are you sure it's carbon buildup and not burning of the paint? I know that depending on how the exhaust is oriented and how frequent flames or WOT pulls are done the bumper plastic and possibly the paint can burn from the amount of heat.
I've tried claybaring it and it only helped slightly..
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Old 07-17-2017, 08:19 AM   #5
vapore0n
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STI Limited SE-R Type (R)

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claybar will remove contaminants, but will not clean paint.
You need something like mentioned above. Klasse AIO is something that works too, without removing clearcoat (much)
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Old 07-17-2017, 10:04 AM   #6
That_Boosted_Life
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pic will help for sure to determine what it could be. Does this carbon feel like it's raised or lowered? Try compounding again and using something called iron-x. Sometimes it takes more than one pass to get results.

Still think it's heat fatigue of the paint. If it looks like the below pic then that's most likely what it is

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