Rewmar RP can be applied on concrete screeds containing up to 98% RH with three coats, Coverage: 5ltr/6kg = 17 - 40m2, This product is not suitable for use with bitumen substrates, you must use Rewmar MB. 1 Coat(coverage 40m2): Rewmar RP can be used as fast drying adherence primer on porous / non-porous or smooth substrates (ceramic tiles, adherent and cohesive paints, traces of old glues, etc.). It can be applied either before or after applying a screed/latex but before applying Rewmar MS Polymer adhesive. 2(coverage 24m2) - 3(coverage 17m2) Coats: Applied in cross layers, Rewmar RP can be used as a moisture barrier for waterproofing of absorbent surfaces up to 95%RH. Note: if the Concrete Moisture is over 75%RH and a liquid batten installation is performed then Rewmar MB must be used. This product is suitable for use with Underfloor Heating.