M-D 0.375-in x 20-ft Closed cell Backer Rod, Gray

What Customers Are Saying

Customers overwhelmingly praise this backer rod for effectively filling gaps before caulking, with most reporting it saves sealant, creates professional-looking finishes, and improves insulation by blocking drafts. Reviewers consistently describe it as flexible, durable, and easy to cut, compress, and fit into tight spaces without special tools. Many highlight successful use around doors, windows, trim, flooring, and driveways. A few note the diameter may be slightly smaller than expected, though this rarely affects results. Overall, customers consider it an essential, reliable solution for quality caulking preparation.