With the temperatures of the powerhead, i think the inexpensive real thin Teflon tape might melt, be effected by oil and fuel and not be very effective. It is made for sealing threaded connections for water , natural gas and propane pipe plumbing connections. There are some more expensive types that might work ok. I believe there are better options ,anti- Seize and BRP Gasket Sealant as recommended in their manuals, and recommended by our members who worked for OMC. Thanks guys.
I use BRP Gasket Sealant on all the bolts on the whole motor. Not just on the threaded portion, the whole bolt. Corrosion can start under the bolt head ,not just the threads. It is kind of messy, gotta clean around the bolt head when you are finished for a nice neat job.
There are some good anti -seize compounds that work well also. I have some Jet Lube Marine Grade Anti – Seize i use on the trailer wheel lug nuts etc.
Happy New Year !
EDIT
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