for what it is worth...
I live on the tundra in AK., where you literally get COVERED in mosquitos. There's DEET, and then there's junk. 29% will do the trick. Stronger versions usually only mean less frequent reapplication. Keep it off plastic, including breathable raingear.
One of the most amazing products i've seen is the bugshirt.
Bugshirt this is the only one that really has it's act together. We'll be bringing ours, but don't expect to use them. Better safe than sorry.
Skin-so-soft is junk. A friend of mine is the Avon rep. here, she won't let people buy it for bug repellancy.
Oh, and nothing beats Benadryl gel if you do get bit by the wee beasties.