jonwvara 

I'm tying to get the stuck seatpost out of my Gran Sport frame. It's a fluted Sugino post. If it were smooth, I'd turn the frame upside down and pour some PB Blaster down the seat tube through the bottom bracket and let it soak like that, but if I do that with the fluted post the oil will all run out.
Is there some good way to seal up the gaps between the flutings and the seat tube to keep the oil from leaking out? Plumber's putty? Some kind of wax? PB Blaster seems to dissolve a lot of things, so I'm not sure what might work.
I'm not at all averse to experimenting on my own, but since the whole point of this forum is to prevent unnecessary and repeated re-invention of the wheel, I thought I'd see if anyone else already has an answer to this one.
I just hope this doesn't turn into a complete fecking nightmare. I'm probably due for one--have dealt with a bunch of somewhat-stuck posts in the past, but nothing that required heroic measures.
Well, okay, there WAS one that I required the combination of finesse and brute strength that is the hallmark of Frank the Welder. Maybe I will threaten this frame with him and see if that causes it to panic and loosen up.
JV