Jan,
No discussion neccessary; Peter Weigle Framesaver and nothing else. Like I've said before, "Less filling and tastes great". Seriously though, everything else simply comes down to compromise. Honestly interior rust is not a problem of extreme magnitude in most cases; but nothing like some cheap insurance for that collectable bike. LPS-3 doesn't even come close and it's value as an interior coating for frames is nothing short of rediculous. It may work as a mental massage if one was a cheapskate; but it would probably do more good if you sprayed it in your ears.
Brian Baylis
La Mesa, CA