I would stay away from dope (pipe Sealant) in your boat. It makes a mess, it doesn't come out of carpet and its a pain to clean up when you do it again next year. Not that you will spill but tape works just as well and is easy to clean off next year. Teflon tape will hold up to anything you engine can throw at it. If you want the extra assurance, buy the grey teflon tape designed for stainless piping. That stuff is the best stuff out there. Just make sure you apply the tape in the direction of the threads. You will be golden.
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