I used to use a lot of 5 gallon buckets, refining, I would have them stacked one on top of the other, seems like they were always getting stuck together.
If you throw ice in the top one, it shrinks the bucket, and that sometimes will do the trick. Or if you freeze them. I have also used compressed air. If you can't do that, but you can get enough space on the side to sprinkle in baking soda, and then pour in vinegar, it will build up pressure inside the bottom bucket and force the top one out. Expansion and contraction using heat and cold, respectively works sometimes. Using a torch lightly, very lightly, around the area where the two buckets meet sometimes works.
Good luck to you!
Scott
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