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@Clockwise
I have a seatpost to remove, took it over to @privatepatterson to stick it in a vice and didn't move so now looking at chemicals. I have chopped it about an inch from the end of the frame and measured sticking a tape measure down to hook the end of it that 13cm of post are inside the frame.
Looking now at the caustic soda methods, has anyone tried slower repeat applications or is it always going to be a violent thing with chemicals splashing about?
Also how long does it take, if I had say 4 hours to let it sit and bubble and reapply would that be enough?