One Litre Ardex MultiPrime. Improves adhesion of various substrates. For internal & external use. Water based – no solvent hazard. Quick drying – apply subsequent products sooner. Usually one coat is enough except for very porous substrates. Drying Time : 15 – 30 minutes @ 23C and 50% relative humidity. No mixing required. Coverage per litre – approx 6 square metres.