Removing a Stuck Seatpost Using Chemistry

Mixing an unholy concoction of water and sodium hydroxide to melt a stuck aluminium seatpost from a steel frame. THIS METHOD IS GUARANTEED TO WORK!

Recipe:
1 litre COLD water
400 grams of sodium hydroxide - also knows as caustic soda or lye, which you can easily buy online. It's basically a drain cleaner.

Method. Add the powder to the liquid (NOT the other way round!) and ensure it's mixed. Make sure you wear gloves, protect your eyes and skin and wear a mask. This stuff is evil and gives off fumes once it starts to work.

Remove BB and invert your frame so the BB shell is uppermost and you have access to the bottom of the seat tube. Carefully pour your chemistry experiment into the seat tube (it will spill out of the seat tube bottle boss holes if you've removed them - probably a good idea to stop at that point). You will hear a "fizzing" sounds - this is the chemical reaction. Congratulations - you're winning.

Leave for 24 hours, empty what will now be a nasty grey sludge (essentially molten aluminium), rinse and repeat.

Took me about 4 lots before the aluminium became to thin I could easily knock it out.

DO NOT USE THIS METHOD ON AN ALUMINIUM FRAME!