Not a problem. I was hiking in southern Ohio in July, on a really hot day. I was wearing Chaco sandals, untreated, and shorts, also not treated. This was my experiment to see if Chacos could handle backpacking weight during the summer months. I hiked from about 1:30 to about 6:30 or 7. Right when I left the car, I put on Repel brand 15% that I think I got at Walmart or Target. I sprayed liberally over my exposed legs and also on my clothing and shoes. The trail was extremely overgrown. I was walking through waist high grass and thorns for much of the time. (I won't go back to that trail unless it is winter) The trails were sunny cuts through woodlands, the perfect environment for both ticks and poison ivy. The heat was overwhelming, but I now regret the shorts and sandals experiment. Although I was sweating, I didn't cross any creeks until about 1 hour before I made camp. I didn't re-treat during the day. I agree that it might have worn off, sweated off or just been rubbed off by the constant brushing of the grasses. Still, it seemed like I was well within 8 hours of effectiveness.
When I got to camp, I checked for ticks. They were all on my shins and lower thighs. They were nymph deer ticks. I had to sit on a log and pick for quite a while. I have several moles and freckles on my shins. After a while, I thought they all were ticks.
I only picked off the ones that moved. They were not dug in very much. A slight tug and they came right off. The trick was finding them. They are really small!
My hammock was treated with Permethrin and I didn't have any mosquito or tick problems during the night. (although trying to sleep in a bug netted hammock in 85 degrees is awful)
The next day, I had a very small spray bottle of Natrapel brand 20% that I got at REI. I applied it very heavily on my shins and thighs. I did not go back the exact same trail to the car, but there was similar terrain, maybe a bit less undergrowth. I checked very carefully at the car and didn't find anything, although it was in my head now and I "felt" imaginary ones for the entire drive home.
I realize that this is one anecdotal episode and not very scientific, but it is convincing enough for me. 20% all the way. If they ever come up with 30%, I will probably buy that. I hate ticks.
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