A 1-component, paste-like polyurethane-based adhesive/sealant which is cross-linked (cured) by the moisture from the air to form a rubbery-elastic material. The skinning and curing times are both dependent on the humidity of the air and the temperature but the curing time is also dependent on the depth of the joint. These times can be shortened by raising the temperature and humidity. Low temperatures and humidities have a retarding effect.