Sikalastic®-621 TC

Liquid applied single component aliphatic, polyurethane saturating resin. 

Sikalastic®-621 Roofing System combines cold applied, aliphatic, single component, moisture-triggered polyurethane resin with fiberglass mat or polyester fleece reinforcement to create a seamless membrane and flashing system


▪ Proven technology with over 30 year track record
▪ Single component - no mixing and ready to use Fully reinforced with highly conformable Sika Reemat Premium or Sika Fleece
▪ Cold applied - requires no heat or flame
▪ Moisture triggered chemistry that is rapidly weatherproof after application
▪ Resistant to ponding water
▪ Highly elastic and crack bridging - retains flexibility even at low temperatures
▪ Seamless and fully adhered
▪ Vapor permeable - allows substrate to breathe 
▪ UV resistant and non-yellowing
▪ Abrasion and chemical resistant
▪ Adheres to most common construction materials when suitable primer is used
▪ Root resistant
▪ Easily recoated renewable system - no stripping required