Primer MF can be applied to concrete slabs and screeds that show high moisture and high pH before the installation of floorings sensitive to humidity such as cementitious levellers, wood, rubber or vinyl. Primer MF can be applied to substrates with moisture up to 6% CM (measured with Carbide hygrometer – UNI 10329) or relative moisture up to 100% RH (measured with in situ probe test – ASTM F2170 – BS 8203).