Is there a similar substitute for Mylar?
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I've discovered the cheapest Mylar around-- only 2 bucks$! You save 18 bucks$ a roll! It?s a Christmas present wrapping Mylar called Polywrap 
- Waterproof
- 50 square ft. a roll
- 1 mil (@ .001 inch) thick X 3 1/2 ft. wide X 20ft long.
Note: Only buy the very Bright and shiny Mylar-type wrapping!
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