DEET – How much for high Sierras mid-late July?

I've heard 30% DEET is needed. How much you need is up to you and how many bugs you can tolerate before applying a repellent. For me, they have to be pretty bad to the point I can't do anything between swats.
Duane

Check the High Sierra Topix, lots of info on mosquitoes right now.

http://www.highsierratopix.com/community/viewtopic.php?f=1&t=7562&start=48

http://www.highsierratopix.com/community/viewtopic.php?f=1&t=7858

http://www.highsierratopix.com/community/viewtopic.php?f=1&t=7828

The REI Jungle Juice is something like 98% DEET. Doesn't take much to cover your exposed skin.

Not sure if this was the problem, but years ago a small amount of DEET leaked at the bottom of my nylon pack. A while later the material deteriorated at that spot. Not 100% the DEET did it.

Normally a net, gloves and clothes provide adequate protection for me. May not work for others.

I was leery of Permethrin too. However, I've treated my hiking shirt for three seasons now and I haven't seemed to suffer any ill effects. Nevertheless, I did just switch from a capilene base hiking shirt to a Western Mountaineering sun shirt that has the added benefit of being loose fitting and made partially of nylon. It's excellent against mosquitoes. In the worst part of the season I also wear a Solumbra shade hat; i.e. it has a drape that you can velcro closed over most of your face when confronted with a swarm of skeeters, then "unzip" when in the clear. That and a headnet and sun-grubbies for my hands means I can go deet-free.

"Major question I have is how much DEET I will need per day/week for the trip."

IMO, determining how much to bring is almost more important than % DEET. As a Sierra hiker who takes no netting – neither for my tarp nor headgear, etc, I think I have a pretty good handle on mosquito repellent.

I apply 3m at the TH with a good dosing of Ben's as frosting. My ROT is 1oz for every 3-4 days. I have those handy little REI 1 & 2 oz bottles in which I mix 1/2 3M and 1/2 Bens.

3m http://solutions.3m.com/wps/portal/3M/en_US/Ultrathon/Products/

Bens http://www.amazon.com/Adventure-Medical-Bens-30pct-Spray/dp/B0044CVRZC/ref=pd_sbs_lg_6

Also, don't forget sunscreen. Rather than take little bottles of Bullfrog, etc, I simply dispense a big bottle of no-brand sport SPF 50 into 2 & 4 oz bottles. My ROT is 2x DEET.

For example, a 4 day hike would require 1 oz DEET & 2 oz sunscreen. This assumes a very liberal bathing of each @ the TH.

Also, take a big sun-hat – and not those silly floppy caps either. Lifeguards, surfers & construction workers have been wearing these out in the hot sun for decades:

http://www.scuba.com/scuba-gear-238/078015/WET-Lifeguard-Hat-Original-Flexfit-Surf-Hat.html

FWIW, I never bought into the notion that high DEET content was necessary. I tend to use lower DEET content repellent and apply liberally and frequently. I actually like Off! Skintastic at only 7% DEET.

Last year on my last day out after coming over Kearsarge Pass, I gave away the 15+ year old Bens that I had to a guy who forgot his, shows how much I used over all those years. If you have ta bathe in it, I guess you'll need a lot. A little DEET goes a long ways, it's not like applying hand lotion to your hands. Can't help there.
Duane

IIRC, the benefit of increased DEET concentrations is in duration, rather than effectiveness. (This will determine how often you re-apply; durations listed on the package are probably optimistic.)

As DEET is notoriously nasty to plastics (and not exactly non-toxic), I would also suggest taking a look at a 20% Picaridin product. The effectiveness may be similar, but without the risk of melting your gear.

DEET just plain works, but I have found that the 3M Ultrathon really does work for a long time with similar effectiveness to the old standby, 99% REI Jungle Juice. Ultrathon is "time-release" and I'm impressed with its performance. The thing with DEET is that you really want to keep it off your nylon gear and then there's that mutation thing… so I use a combination of products in the High Sierra:

–Ultrathon in the liquid pumper, for my legs and arms in the morning
–Picarin spray for use on trail w/o concern where it goes
–Pyrethrin-soaked headnet on my pyrethrin-soaked hat, above my pyrethrin-soaked, light-colored hiking shirt (which I wear over a very light inner layer.
–Pyrethrin-soaked tent body and fly
–wash-off at night to minimize transfer of the DEET and other oils to my bag.

Now, the pyrethrin-soaked tent parts have been compared to similar size and color tents nearby and they do have fewer of the vulturous beasts hanging out on them at night than the tents w/o. The headnets…well, the little fellas seemed unaffected, but I think the cheapo, Coughlan's headnets are one of the best purchases for High Sierra happiness, ever. Ha ha!

I.