Just got my Coroando Coropoxy 100% solid epoxy, The label says apply at 80 sqft for 20 mils or 120sqft for 15mils. I will be somewhere in the middle as i am doing 600sqft. I have enough epoxy for two coats 1200 sqft. Should i do two coats of epoxy? My plan is to grind my floor with an edco...