A low-modulus, moisture-curing polyurethane sealant that is ideal for expansion joints in horizontal applications due to its nature as a semi- self leveler. Vulkem 45SSL is especially well suited for sealing expansion joints in concrete. Vulkem 45SSL has a skin-over time of 5 hours at 75°F at 50% RH. At these conditions, the sealant will be tack-free in 17 hours and continue to cure at a rate of 1/16 per day. At higher temperatures and higher humidity, the sealant will cure faster while at lower temperatures or lower humidity, cure rate will be extended. The cure of Vulkem 45SSL can be accelerated using minimal amounts of potable water. Contact your local Tremco sales representative or Tremco Technical Services at 866-209-2404 for specific guidelines and recommendations.