Tech data sheets have been updated for Koster and Ardex MC and as you noted, both state 7 day waiting period. However the original MC formula touted it would drop MVER levels from 20lbs to 3 lbs. So, if freshly placed concrete is 28 lbs or so, a drop of 8lbs would make sense (perhaps after 7 days). The variable of course, is still curing and drying conditions. Regardless, noboby claims their products can be installed on fresh concrete. That was just a wrong thing to even consider!
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