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Have to say I found the caustic soda route disappointing, partly due to my own inability to stop the solution running out of the frame and once I did keep it contained seemed to have limited impact on the seat post despite bubbling & smoking like a chimney at times.
I even left it over night. I’m sure if I kept going it would eventually dissolve but probably just as cheap to take it LBS and burn it out.
Lampman
russmeyer
I was very cautious at first but lost patience when it took so long and decided to just make the solution as aggressive as possible to get the damned post out. You can see where the lye ran and ate through the paint. I suppose a careful masking/plastic film job could have saved the paint.