I'm not going to say how I know this, but have extensive experience in this area.
A few things. Picaradin is a great choice for spraying on your gear/clothes. DEET is a plasticizer and will ruin hunting/fishing gear and in theory damage synthetic materials such as cotton/polyester blends. I sure wouldn't spray it on your swimsuit. I'm not as familiar with Permethrin as for skin contact. I know it's used in foggers/fumigators to kill pests in the home. For that reason, I'm a little leary of it. I also really question the comment someone made about being able to wash your clothes 6 times and it remaining effective.
If you're worried about DEET safety, know that DEET % is tied to hours of effectiveness. So using a lower % of DEET will be just as effective as a higher % over a short amount of time. You would need to reapply for the effectiveness to maintain...which you should do anyway. If you blast yourself with DEET, then wipe your arm on your shirt, some of the effectiveness is lost. Mosquitos can find an untreated area the size of a quarter, so make sure after you spray that you spread it around with your hands to completely cover your skin.
Hope this helps.
I agree that DEET is very effective and safe.
I am a little disappointed that you chose to cast doubt on my information regarding permethrin, especially as a quick internet search yields quite a bit of reliable information about the subject. I would add that I am also experienced in this area, and I will say how. I am a physician, I have been a member of the Wilderness Medical Society, I have gone on medical missions to third world countries (requiring mosquito safety for everyone on the team), and I am the travel med doc for our office.
Let me point out a few resources that can be useful for learning about permethrin treatment.
The first is from the United States of America military. A pertinent paragraph reads:
Uniforms treated with permethrin in factories are preferred to
individual treatment. Factory-treatment is the most efficient
and fastest method of uniform treatment. Tests show
factory-treated uniforms may provide protection for up to 50
launderings, but treating uniforms with permethrin sprays or
kits only will be effective for 5 or 6 launderings. When
permethrin is applied before the uniform is purchased or
issued, it reduces the risk of Service members being
exposed by breathing vapors or coming in contact with skin.
Following individual treatment, make sure uniforms dry
completely before wearing them.
http://dhl.dhhq.health.mil/Product/RetrieveFile?prodId=242
Another useful site is REI.com, which sells clothing treated with permethrin at the factory. It is exOfficio's "Buzz Off" line of clothing:
http://www.rei.com/s/insect-repelle...|google|main&gclid=CPKIhYPH3r8CFQwV7AodGX4AIg
You can also read about permethin treatment spray on
Amazon:
http://www.amazon.com/Sawyer-Produc...8-1&keywords=sawyer+products+insect+repellent