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@Cranky
I have used waxoyl on the inside of the frame tubes and plugged all holes used for venting during welding. I then rode the bike for 2 weeks during which time I was out on two wet days. After this I examined the inside of the bottom bracket shell (which was heavily greased throughout) and found traces of water droplets.
I am confused as to how or why an inner tube over the seat tube would make a big difference. I would have thought the seat post clamp would have prevented a good seal of the seat post-tube interface.
I also think that one of the most likely places for water ingress would be around the bottom bracket adjustable cup on the non-drive side. This is like a sleave over the bottom bracket and can allow water in.
Also being a chemist who works with vacuum systems I know that the vent holes in the frame do not allow enough air exchange to permit drying of the inside of the frame to take place. Once water is in there it will either stay or react with the tubes ie oxidize or rust.