Exhaust flange seals

[Jim Green]

I need advice on the best type of seal to use.  My
brand new exhaust that I had put on the car has
already blown through a seal on the flange that was
put on the downpipe.  After dropping the exhaust, I
had to clean all the Goo off the flange that was
previously sealing the inperfections.  For the amount
of money I paid the Bozo's who did this, you think
they could weld a flange on strait.  I did some
grinding, but it is still not perfect.  Is there a
seal that will make up for a slightly warped flange? 
I can bring it back to them, but I would like to just
get it done with and not have to drive 1.5 hrs each
way to have them do it.  I put a crappy felt one in
there for the time being, but it is slightly leaking. 
What about using two gaskets?
Thanks,

=====
Jim Green
'89 90tq 
http://www.geocities.com/jeg1976/

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