Poly Foam Caulk Saver acts as a filler in large gaps before applying caulk. Insulates and cushions. Use in pavement cracks, wall joints and foundations. Non-absorbent, closed-cell polyethylene pre-caulking materialUse before caulking to fill gaps and openings larger than 1/2" x 1/2"Prevents 3-point bonding20'3/8"