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Old 07-15-2005, 10:19 AM   #1
SlackMeister
Scooby Newbie
 
Member#: 81655
Join Date: Feb 2005
Chapter/Region: MAIC
Location: Chantilly, VA
Vehicle:
2004 WRX SportWagon
silver

Default patching rust spot on muffler?

Sorry if this is a dumb question, just figured better safe than sorry. My WRX of course is pristine, but a friend recently noticed rust on her Suzuki's muffler. Replacing the muffler is a big-ticket item for her, but it's not rusted through yet. I'm figuring we'll sand off the rust, then spray some primer.

* The question is, will everyday spray primer stand up on a hot muffler? We don't need no 4wd hibachis! And if it won't, what else do I need for the job? Thanks
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Old 07-15-2005, 10:26 AM   #2
Mulder
Trust no one
Moderator
 
Member#: 11170
Join Date: Oct 2001
Chapter/Region: Tri-State
Location: NYC
Vehicle:
02 WRX
15 WRX/05 GTO

Default

The problem is that mufflers and exhausts rust through from the inside out. What you see is just surface rust on the outside, but what eventually makes them perforate is the internal deterioration from the condensation+heat+corrosive stuff that attacks them inside.
You'll be wasting your time trying to paint the outside. The paint probably won't stay on and it won't prolong the life of the muffler anyway. Leave it alone until it rusts through, then replace it.
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