RonaFloor Repair 1 Hour 25mm+ is a prepacked rapid hardening polymer modified mortar which reaches high compressive strength after just one hour. The repaired surface can be opened to traffic after 1 hour. RonaFloor Repair 1 Hour 25mm+ can be used from 25mm upwards. As well as achieving rapid strength, RonaFloor Repair 1 Hour 25mm+ can be used down to a temperature of –10°C, when conventional mortars cannot be used.