According to the chart I saw, the 100% Deet was only slightly more effective than the 20%-40% Deet. It was more effective to apply 20% Deet and then re-apply it a while later than to break out the 100% stuff. Also, the 100% stuff can disolve some synthetic fabrics and zippers. Not completely, but gets them all gummy. Plus, it feels all greasy.
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