Should I trademark prehistoric cement previously I stick unsullied tiles onto it? I am covering the floor of a utility shed with tiles....

I am covering the floor of a utility shed with tiles. Should I enjoy sealed them first or is the idea some of them are loose because I walked on them previously the stuff dried?
Answers:    I am a concrete finisher and dont know much about tiling but I dont deduce it matters if the concrete wasnt hermetic and walking on them before they dried could probably enjoy moved them enough to loosen them depending on how flat the concrete is and how much nouns was underneath them.