A buddy of mine in the Mercedes diesel world, used this stuff call Jet-Hot
to coat his exhaust manifolds.  Apparently it minimizes radiant heat which
builds up in the engine compartment, as well as eliminating rust
issues--dunno for sure.  I think you send the items off and they
professionally coat them for you.
http://www.w124performance.com/images/OM603_exhaust/Jet-Hot1.jpg

http://www.jet-hot.com/

On Tue, Jul 22, 2008 at 5:39 AM, dylan friedman <insyncro@yahoo.com> wrote:

> Header wrap is not to be used by itself.
> Use a sealer to keep the water out.
> DEI makes a very good sealant and comes in colors.
> I have written about this numerous time and it is in the archives here and
> in the Subie swap forums.
>
> All my exhaust systems have some wrap on them and have been sealed
> properly.
> No Rust at all. I have checked.
>
> When driving in the rain, drag you brakes for a couple thousand feet before
> stopping and let the van idle for a minute or two after reaching your
> destination to keep water out of the brake system and rust the pads to the
> drums and heat the wrap up enough to remove the water from

Casey
'87 300TD
'94 100CSQ Avant
'89 Bluestar
The People's Republic of Cascadia