This is very easy way to make cement floor. Basic material is on modelling material, very fine sand and few shade gray paint.
Spread modelling material over to base. Then put gray paint and sand on modelling material.
Next step is mix all together. Use lot water , but put it only with finger. Sand gives little rough surface, but its fits well on workshop. Maybe sanding dust fit better if need smoother surface.
Final step is weathering cement floor. This depends which purpose floor will be come. My floor come to workshop., so its very dirty, Base weathering i use Citadel earthshade. I mix its lot of water because without water is too dark.
Thank you for viewing!
I hope at tips is useful