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FDM is very very hard to make smooth. Try to add a cork instead of the plug in the base. That would make it water tight. Also look into this to smooth out the whole rocket.

http://www.youtube.com/watch?v=w32DcpYC1QMhttp://www.youtube.com/watch?v...

If you go down this path you might need to design metal fixtures for both parts to make then exact.

Very cool design! ;)

Mark F