I spend all summer in the tick and mosquito infested border country of the BWCA Wilderness and Canada's Quetico park. I started using the Permethrin spray a few years ago and swear by it. I treat all my outer clothing and especially my hammock netting, and I almost never need to use DEET. The folks that I guide think that the bugs just respect me too much to bite me, but I really know the truth. Beware of 100% DEET, and it will destroy fish line, plastic eyeglass lens, watch lens, GORTEX, etc. I find that 40% does the job, and just re-apply when necessary. A pump spray bottle is better than an aerosol, and I don't like the kind where you have to rub it in with your hands. Then it eventually ends up in my eyes, mouth, nether regions, etc.