Black or dark gray pipe insulation as pictured above can be used on roof racks but does not have the material strength of the foam noodles sold at Walmart and other stores. Foam noodles use material that is denser and stronger than pipe insulation, and can be used for rolling a 250-lb sailboat down a grassy slope while pipe insulation will get crushed by the weight and not hold its round shape.
The pipe insulation definitely has its uses but is a lot softer and has less overall strength than a foam noodle. I don't think it has anywhere near as much flotation buoyancy as a foam noodle so it is somewhat different stuff like the difference between rubber and flubber ..... (ha-ha!)
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... down and out, liv'n that Walmart side of the lake!
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