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Copper grease on exhaust #4527530
09/27/17 11:57 AM
09/27/17 11:57 AM
Joined: Jul 2015
Posts: 23
Europe
EWPE Offline OP
EWPE  Offline OP
Joined: Jul 2015
Posts: 23
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?




Last edited by EWPE; 09/27/17 12:03 PM.
Re: Copper grease on exhaust [Re: EWPE] #4527559
09/27/17 12:41 PM
09/27/17 12:41 PM
Joined: Jan 2013
Posts: 910
California
Kool1 Offline
Kool1  Offline
Joined: Jan 2013
Posts: 910
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.

Re: Copper grease on exhaust [Re: EWPE] #4527582
09/27/17 01:01 PM
09/27/17 01:01 PM
Joined: Nov 2009
Posts: 1,057
Warner Robins, GA
nwjones18 Offline
nwjones18  Offline
Joined: Nov 2009
Posts: 1,057
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
Re: Copper grease on exhaust [Re: nwjones18] #4527598
09/27/17 01:17 PM
09/27/17 01:17 PM
Joined: Dec 2016
Posts: 6,247
Waco, TX
Linctex Online content
Linctex  Online Content
Joined: Dec 2016
Posts: 6,247
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.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Copper grease on exhaust [Re: Linctex] #4527608
09/27/17 01:29 PM
09/27/17 01:29 PM
Joined: Jul 2015
Posts: 23
Europe
EWPE Offline OP
EWPE  Offline OP
Joined: Jul 2015
Posts: 23
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.

Re: Copper grease on exhaust [Re: EWPE] #4527617
09/27/17 01:40 PM
09/27/17 01:40 PM
Joined: Aug 2010
Posts: 5,680
Champlain/Hudson Valley
Kira Online content
Kira  Online Content
Joined: Aug 2010
Posts: 5,680
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.

Re: Copper grease on exhaust [Re: EWPE] #4527619
09/27/17 01:41 PM
09/27/17 01:41 PM
Joined: May 2005
Posts: 395
Nevada
heynow Offline
heynow  Offline
Joined: May 2005
Posts: 395
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.


1991 Acura NSX
2005 BMW r1200GS
Re: Copper grease on exhaust [Re: EWPE] #4527682
09/27/17 03:16 PM
09/27/17 03:16 PM
Joined: Apr 2017
Posts: 1,480
Ontario, Canada
mightymousetech Offline
mightymousetech  Offline
Joined: Apr 2017
Posts: 1,480
Ontario, Canada
Copper grease on the exhaust? Just leave it, seriously. When you get a hole in it, replace it.

Last edited by mightymousetech; 09/27/17 03:18 PM.

Mighty Mouse Tech
BMW Tech, Former Acura Tech
2010 Civic Si Castrol 0W40, Redline MTL
2013 BMW 135i M Sport Edition Castrol 0W40, Redline MTL
Re: Copper grease on exhaust [Re: EWPE] #4528089
09/28/17 04:23 AM
09/28/17 04:23 AM
Joined: Feb 2014
Posts: 593
Margate England
Claud Offline
Claud  Offline
Joined: Feb 2014
Posts: 593
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.

Re: Copper grease on exhaust [Re: EWPE] #4577772
11/18/17 07:52 AM
11/18/17 07:52 AM
Joined: May 2014
Posts: 28
New York
JoeJ Offline
JoeJ  Offline
Joined: May 2014
Posts: 28
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.


Joe

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