TotalBoat Tabletop Epoxy will make a very strong mechanical bond to concrete, especially if the surface is clean, and free of any contaminants.
Epoxy can make a great coating for a concrete countertop or work area, but for larger/thicker slabs or concrete floors, it is important to note that concrete emits moisture. The epoxy may form a great bond initially, but if the concrete is emitting a lot of moisture, that moisture can get trapped and potentially lead to delamination in areas.