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Author Message   Aemb04 Tinkerer Username: Aemb04 Post Number: 13 Registered: 04-2013 Rating: N/A Votes: 0 Posted on Monday, July 29, 2013 - 01:25 pm:    Hello, at what concentration. Most chemists sell it between 3 & 9% would this do the job & do I need to clean the inside of the Copal shutter to kill any spores.