If a roll of 6 mil black plastic does not say it is UV resistant ....... Does one presume it is not ? If it does say it is UV resistant, what kind of lifetime will it have in Denver, CO ? ( sunny most days , hig= h altitude ) 99guspuppet --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .