Surface must be clean of loose material, dust, and contaminants that inhibit bond. Mechanically remove a minimum of 1/16" of surface.
Conpro Primer is recommended. In large open areas keeping the surface damp can be problematic. The alternative is to saturate substrate with clean water (SSD) with no standing water.
Apply with a motion similar to placing concrete. Finish with a magnesium float or trowel. Do not over work the finish as this can induce surface cracking.