Sikalastic®-621 TC

Highly durable, UV-stable, versatile and easily applied liquid polyurethane for use with the Sika-Trocal® Liquid Detailing System.

Sikalastic®-621 TC is a cold-applied, one-component, seamless, highly elastic and UV-stable moisture-triggered polyurethane Top Coat (TC) designed to provide easy application and a durable solution as part of the SikaRoof® MTC systems, as well as for detailing on single ply membranes.

  • Proven technology - over 25 year track record
  • One component – no mixing, easy and ready to use
  • UV resistant - Highly reflective (RAL9016) and resistant to yellowing
  • Cold applied - requires no heat or flame
  • Seamless roof waterproofing membrane
  • Compatible with Sika® Reemat Premium - easy to detail
  • Fast curing - free from resin damage almost immediately on application
  • High elastic and crack-bridging - retains flexibility even at low temperatures
  • High root resistance
  • Easily re-coated when needed - no stripping required
  • Good adhesion to most substrates- see primer chart
  • Vapour permeable - allows substrate to breathe
  • Strong resistance to common atmospheric chemicals