Ian wrote: In the ozone of LA in the 80's, a more typical life for that foam was 2 years or so before it fell apart. After 4 years, it was nothing but a gooey yucky mess. And that was the time in the shade; Ozone+sunlight was far far worse to all sorts of stuff. Bike tires made out of synthetic rubber would last for a few months; real rubber had a chance of lasting a year or two. Good that you found a source for small quantities; I always got the equivalent from the HVAC suppliers and they sold it by the truckload only! Tim.