David Martel wrote:

Robert,

The tape should not be necessary to get a drip free seal. The threads are
tapered to prevent dripping. Try assembling, without the tape, when the
engine and plug are at room temp. Check your manual for torque suggestions.
Teflon tape should be very heat resistant. Some thread tape is not
teflon. Look for PTFE.

Dave M.

Teflon (tm) a DuPont brand name for their PTFE. Teflon / PTFE has a
working temp well above the couple hundred degrees that a small gas
engine should be getting to. Pipe threads are tapered for sealing so
just tighten the pipe a bit more.