jeffk, I think you may be confusing pircaridin and permethrin.
PERMETHRIN is sprayed on clothing, allowed to dry, and provides some protection through several washings.
PIRCARIDIN is topical. It is applied to the skin and provides some protection for several hours.
You can wear permethrin treated clothing AND use a pircaradin based insect repellent for a greater level of protection, but you should still do regular "tick checks".
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