BVM PNP F-86 Construction And Operating Manual page 14

NOTE: ONLY USE THE TAPE PROVIDED
Use the tape provided to seal the front opening of
the tailpipe. Use one piece on the forward seam of
the opening and then three pieces across the
opening. This is a time tested method that works.
Once the pipe is in you can trim the pipe to match
the rear opening of the fuselage. You can also
remove the pipe and use flat black testers to paint
the pipe on the outside.
BVM®2017 13 11/07/2017