In summary, prevent mast sections from sticking together by taping them up every time and avoid using excessive force with boom clamps. If a mast does become stuck, enlist the help of multiple people and twist the sections in opposite directions while pulling them apart slightly.If there are not enough manual efforts, then the same can be done using a lever (boom). Take 2 booms, attach them to both parts of the mast and twist in opposite directions.
Using a little water or lubricant beforehand can also help. Remember to only attempt this in cooler temperatures or when the mast has cooled down to avoid causing damage.