I spray Permethrin every 6 weeks and I use IGR (insect growth retardant) with the Permethrin the frist and last spray of the season. I do all around the house and it seems to work pretty good. I still swear by Wondercide on myself to avoid needing to put Permethrin on my clothes. If I'm going in the thick stuff, I'll also throw on my sick tick bands around my legs and waist. I have only had 2 crawling on my neck, both of which I felt and wiped them off. I had shed the shirt that I sprayed so the shirt under wasn't sprayed with Wondercide, so I attribute it to that. No latchers so far. I'm in the yard and woods every weekend.