MD Building Foam Backer Rod, Gray, 20ft x 5/8in for Large Gaps

Customers find the backer rod to be a decent quality product that works well as a gap filler, particularly for deep and wide cracks. They appreciate its durability, noting it can be squished easily into cracks, and its flexibility, with one customer mentioning it's stiff enough for hood shaping. The product receives positive feedback for its sealing performance and cutability, with customers noting it's easy to cut to size. The size receives mixed reviews, with some finding it perfect while others say it's not accurate.