Newbie help - stuck seat post

PlusGas

But go into any hardware store and ask what they have. The last I used was about a fiver and came in an orange and black spray can. All does the same.
 
I have a crank puller tool if you want to use it.

Best penetrating oil I have used was what an old bloke into guns used to clean them, acetone, autotrans fluid and lanolin.
I don't have any acetone at the moment so I mix thinners and autotrans fluid, I do have lanolin but i didn't bother adding it.
 
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