First and most obvious is to make sure the exhaust lip and the flange (the two mating parts) are undamaged and not 'flared'. Assuming both are OK, what we did was to get some grinding paste, smear it all inside the exhaust lip and then twist away! It can take a while and keep adding paste (it's cheap anyway) but you can see when you separate the two where the paste has been. Once both mating faces are marked consistently all the way round, you should have a good seal that will require minimal - if any - sealant. Key to this is to ensure there is no damage to start with and then plenty of elbow grease. Hope this helps
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