Caulk backer rod. For gaps & joints. Non-absorbant. Closed cell polyethylene. Pre-caulking material. Use before caulking to fill gaps & openings larger than 1/2 x 1/2 in. Prevents 3 point bonding.
Caulk backer rod. For gaps & joints. Non-absorbant. Closed cell polyethylene. Pre-caulking material. Use before caulking to fill gaps & openings larger than 1/2 x 1/2 in. Prevents 3 point bonding.
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