Garage floor Coatings can be Extremely slippery!
Rest assured if the right precautions are taken your floor can be less of a slip hazard. It is important to know that the environment you live in will determine whether or not there needs to be a slip resistant additive added to the top coating.
For Example, if you live in a cold climate your floor will naturally become more slippery and you may want to choose a grit that is more course to add grip in those extreme conditions. In warm climates you may need little to no additional grip, that will be determined by the amount of rain you get in your area. A wet floor could be a slippery floor too but need a finer grit added.