Flex-O-Seal (PU Joint Sealant)

Flex-O-Seal (PU Joint Sealant)

  • $15.80
  • Save $-15.80

PIONEER PRO Flex-O-Seal is a class A gun-grade polyurethane sealant that has excellent adhesive properties and excellent weathering and ageing resistance.

Features and Benefits

  • Excellent dynamic movement capability
  • Low VOC environment-friendly
  • Long-term weather resistance

Application Areas

  • Construction joints
  • Expansion joints
  • Precast panels/most construction substrates


For preparation of substrate, make sure that the surface is clean, dry, free of impurities and uncontaminated by oil or grease.

Method of Application

Any expansion joint filler must be checked to ensure tightly packed and no gaps or voids exist at the base of sealing slot before positioning a bond breaker. To guarantee free movement and maintain a recommended sealant depth, it is important to install a bond breaker where it becomes an integral part of the joint. Apply masking tape on both edges of the joint for cleaner application.

Apply the sealant in one layer for joints of small width. For joints of large width apply the sealant in three layers, the first two onto the edges of the joint and the third onto the bottom. Smooth with water free of additives. Press the sealant correctly against the edges and the bottom of the joint while avoiding inclusion of air bubbles. Remove the masking tape. Afterwards, the surface can be painted over after full curing.