PS Swell Mastic is a one component, polyurethane based, solvent free, hydro swelling mastic, supplied in cartridges and Aluminium sausages, for the sealing of construction joints. PS Swell Mastic cures and swells in the presence of moisture curing time depends on the temperature and humidity conditions i.e. curing time will reduce if the temperature are higher. PS Swell Mastic will become firm in 24-36 hours. Performance is not affected by the curing time.