I haven't tried this, but I found the tip sheet from the POR-15 that I bought a
couple of years ago.
One of the tips is "POR-15 Inside Rear Exhaust will stop rust where it starts.
Soak
a round glass cleaning sponge with POR- 15 and pull it through the pipes with a
wire. Coat exterior from the muffler back."
Roger Elliott
Jjcousins@ra.rockwell.com wrote:
> Anyone ever paint any part of their exhaust with POR-15? As I'm looking at
>the
> surface-rusty pipe under there, I'm thinking this would be great to prevent
> rust-through. Any thoughts before I do it and regret it as it burns off for
>the
> rest of the summer?
>
> John Cousins
> 77' Spit
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