dia......
Not if finished off properly. Besides 1,000's of shoes shuffling around and dancing will become much more slippery than any clear coat you might put down. The more wear and tear that floor gets from dancing... the more slick it will become. For a dance floor.... you want a floor that is not slippery or makes your feet come to a screeching halt. Proper coating will do that. However, I don't think it will be necessary on cement.
Dance floors are something I have a lot of background in. In fact, we put a 1,000 sq ft floating floor in our basement where my wife teaches all kinds of Ballroom and Salsa/Merengue/Cumbia dances. Been doing this stuff for 20 years.
I've painted many wooden floors over the years and based upon the kind of floor and its intended use..... the finish is the key element.
Ever hear basketball players' sneakers at a game ?? Well, that's the total opposite of the kind of floor you want in a dancing area. Again, I'm talking mostly wooden and tile floors, but regardless of the makeup of the floor.... dancing shoes will make it fast and smooth very quickly except on high humidity days.