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Join Date: May 2008
Location: Fredericksburg, Va
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Bikes: '65 Frejus TDF, '73 Bottecchia Giro d'Italia, '83 Colnago Superissimo, '84 Trek 610, '84 Trek 760, '88 Pinarello Veneto, '88 De Rosa Pro, '89 Pinarello Montello, '94 Burley Duet, 97 Specialized RockHopper, 2010 Langster, Tern Link D8
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PB Blaster is used by 4x4 guys to free suspension parts that have been rusted on for decades. It works.
Although the seat attached to the post provides good leaverag, I would expect a pipe wrench would be even better. Just expect to damage the post. Since it is a steel post in a steel frame with rust as the glue, this just might be a supper challenge (this is what PB Blaster was made for).