Some have asked if the primer is a non-pigmented version of the final coats. The MSDS sheets say its different and and is used for both green and "adverse" conditioned concrete. Here is the product bulletin:
http://www.pacpoly.com/primers/EPprimer/EPP.pdf
I just went out to check on it to see how well it has cured. In low 50 degree weather, it has lost its tackiness and is getting some hardness into it.