DYNAFLEX 230 Premium Indoor/Outdoor Sealant


DAP® DYNAFLEX 230® PREMIUM 100% WATERPROOF WINDOW, DOOR AND TRIM SEALANT is a premium elastomeric “Silicone Tough” latex formulation that delivers outstanding performance against the elements. It provides superior flexibility and elongation to seal joints up to 50mm wide and endure expansion and contraction without cracking or losing its seal.

DAP® DYNAFLEX 230® stays permanently flexible to withstand movement without cracking or losing adhesion. It forms a long-lasting, durable seal that is 100 percent waterproof and weatherproof to stand up against heat, sun, rain, wind, snow and cold temperatures. Won’t crack, crumble or chalk.

Ideal for Natural and Synthetic Materials, adhering to a wide range of building materials including wood, MDF, fiber cement, vinyl, aluminum, PVC, polystyrene and composite trimboard.


  • Paint ready in two hours – No primer required and won’t crack paint film
  • Easy Application and Clean-up
  • Exterior and Interior Use
  • Seals joints up to 50mm wide
  • Superior flexibility and crack-proof
  • Ideal for natural and synthetic materials
  • Available in 10.1 fl. oz./298ml Cartridges
  • Available in White and Clear
  • It calls out “Silicone Tough” for outstanding exterior performance
  • Indicates ASTM C920 class 25, which is the same performance standard met by standard window & door silicones in the US
  • 50% joint movement (+/- 25% joint movement)
  • Total elongation 470% (superior to standard window & door silicone)
  • Much easier to work with and tool than silicone
  • Paintable, which silicone is not

MSDS Product Sheet