Hard To Kill

Be sure that the Bondo fills the pipe to a one inch depth

And starts to ooze out of the holes you drilled

Let the Bondo harden then drill a hole

In the center of the pipe section for your fuse

Next stand the pipe up with the Bondo end cap down

And fill halfway up with propellant leaving enough room

For your fuse or igniter to be secured against

The opposite pipe wall with glue