Condensation on painted floor

Hows it going?

I want to paint a concrete floor in a shed but I got talking to someone I know who did the same thing and he warned me that after painting it can get damp with condensation. I work in a factory with painted floors and they never get damp. Has anyone here painted a floor and can you tell me if this is a constant occurrence? Is there something I can do to the floor before painting to eliminate the possibility of it happening?

Thanks!