Sikadur-51 is a 2-component joint sealant of a putty-like consistency based on flexible epoxy resins. After mixing it cures to form a tough but resilient sealant and patching compount. Sikadur-51 is used for sealing joints with little or no movement, particularly in heavy duty concrete floors and is often used in conjunction with Sikafloor epoxy systems. Sikadur-51 is also useful for sealing cracks in concrete.