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The claim: Glad Press 'n Seal Wrap "takes wrap where it's never been before," courtesy of ingredients found in chewing gum. It's supposed to create a spillproof seal on plastic, metal, Styrofoam, glass, paper, and wood. An ad shows Press 'n Seal holding orange juice inside a tipped-over cup, and the box invites users to "take the Glad Press 'n Seal Challenge!": Cover a cup of liquid with the wrap, then turn it upside down. the check: Glad to oblige. We poured a cup of canned peas in water into bowls made of plastic, glass, Styrofoam, china, and stainless steel (12 bowls of each material), covered the bowls carefully and tightly with Press 'n ...