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Good question!
Astroturf have developed many variations over the years, the original from the 60's and 70's has been developed and redeveloped many times and it would be best to contact the company for technical advice. The original product was not a problem, but I guess the original product would be passed it's 'use by' date several times over.
Best regards...170'
Last edited by 170'; 10th May 2013 at 08:40.