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#4527530 - 09/27/17 11:57 AM Copper grease on exhaust
EWPE Offline


Registered: 07/09/15
Posts: 23
Loc: Europe
My 21 years old car still has original exhaust with no holes. Mufflers looks like new, but pipes has a bit rusty surface. I rarely use my car as a short tripper, so it's rather unlikely for exhaust to rust from the inside significantly. Is it a good idea to cover those rusty pipes with copper grease? Should I be afraid of galvanic corrosion? Is there any better way to protect it?





Edited by EWPE (09/27/17 12:03 PM)

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#4527559 - 09/27/17 12:41 PM Re: Copper grease on exhaust [Re: EWPE]
Kool1 Offline


Registered: 01/25/13
Posts: 904
Loc: California
It looks like surface rust on your exhaust which you may want to wire brush off. To make the pipes look better, you can try high heat paint like VHT. I would not coat my pipes with any grease.

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#4527582 - 09/27/17 01:01 PM Re: Copper grease on exhaust [Re: EWPE]
nwjones18 Offline


Registered: 11/30/09
Posts: 1049
Loc: Warner Robins, GA
I think I would just keep driving it and not worry about it.. Any wire brushing you do it just going to rust again.
_________________________
1988 F-150. 4.9 I6 247k. 10w-40 Castrol Syn-blend ACDelco UPF2.
2005 Cadillac STS N* 108k. 5w-30 Castrol Magnatec ACDelco Classic PF61

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#4527598 - 09/27/17 01:17 PM Re: Copper grease on exhaust [Re: nwjones18]
Linctex Offline


Registered: 12/31/16
Posts: 5718
Loc: Waco, TX
Originally Posted By: nwjones18
I think I would just keep driving it and not worry about it.. Any wire brushing you do it just going to rust again.


Yes, the only solution is to remove the rust and apply high heat paint.
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#4527608 - 09/27/17 01:29 PM Re: Copper grease on exhaust [Re: Linctex]
EWPE Offline


Registered: 07/09/15
Posts: 23
Loc: Europe
Originally Posted By: Linctex
Originally Posted By: nwjones18
I think I would just keep driving it and not worry about it.. Any wire brushing you do it just going to rust again.


Yes, the only solution is to remove the rust and apply high heat paint.


OK, but it's not so simple to fully remove rust (even on an removed exhaust) and high heat paints wouldn't last very long on rusty surface. As exhaust is fitted in factory, it has no joint somewhere between mufflers and I would have to remove rear suspension first to be able to remove it then - and that's a lot of work. Applying copper grease seemed to be the simplest, yet effective solution.

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#4527617 - 09/27/17 01:40 PM Re: Copper grease on exhaust [Re: EWPE]
Kira Offline


Registered: 08/19/10
Posts: 4900
Loc: Champlain/Hudson Valley
Would a rust converter work better for you?

The Rustoleum product turns the rust black and takes paint well.

How deeply it will go into rust is something I do not know.

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#4527619 - 09/27/17 01:41 PM Re: Copper grease on exhaust [Re: EWPE]
heynow Offline


Registered: 05/09/05
Posts: 395
Loc: Nevada
Copper grease will burn off the first time you get the car up to operating temperature.
I don't even want to imagine the huge, foul smelling cloud of smoke that it will produce.
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#4527682 - 09/27/17 03:16 PM Re: Copper grease on exhaust [Re: EWPE]
mightymousetech Offline


Registered: 04/03/17
Posts: 1320
Loc: Ontario, Canada
Copper grease on the exhaust? Just leave it, seriously. When you get a hole in it, replace it.


Edited by mightymousetech (09/27/17 03:18 PM)
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#4528089 - 09/28/17 04:23 AM Re: Copper grease on exhaust [Re: EWPE]
Claud Offline


Registered: 02/11/14
Posts: 546
Loc: Margate England
21 years from an exhaust?. Is nothing made to last nowadays?. smile
My wife's Peugeot only managed eleven years on it's original exhaust.

It used to be an annual task, and a battery was a biennial job back in the day.

Leave well alone, don't fix what ain't broke.

Claud.

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#4577772 - 11/18/17 06:52 AM Re: Copper grease on exhaust [Re: EWPE]
JoeJ Offline


Registered: 05/09/14
Posts: 28
Loc: New York
I've used rust converter to convert rust to a more stable element than painted with high temp header paint. Works for me.
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