Just in case anyone takes this seriously - using furniture polish on a dance floor can be dangerous : we were very nearly banned from a venue after a 'Mr Sheen' incident ! It gives very low friction, but looks just like the rest of the sticky floor.
Since then, the venue have applied a non-slip finish.
A tiny amount of Talcum Powder seems to give a controlled degree of slippiness on most surfaces - but test a tiny patch first. Add as little as you can and re-assess. If overdone, there is no easy way to remove it again. It is easy to top-up if you feel more is needed.
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