Before Caulking, Use Backer Rod  To Help Fill Gaps And Openings In Pavement Cracks, Wall Joints, Foundations, Sidewalks And Driveways. The Gap Filler Helps Cushion And Insulate And Helps Prevent 3-Point Bonding.
  ▪  Foam Cord/ Backer Rod
  ▪  Provides A Sound Surface For Caulking Projects
  ▪  For Filling Small Gaps And Openings
  ▪  For Use In Expansion Joints In Driveways And Sidewalks
  ▪  Moisture Resistant
  ▪  Twist Multiple Strands Together To Fill Large Cracks, Gaps
  ▪  Mfg #WS31193