Lab Rat,
I bought some essential oil mosquito repellent last summer that contains tea tree oil, Atlas Cedarwood, Patchouli, citronella, and eucalyptus. It's called Skeeter Beater. These are the directions that came with it:
Bath, 6 to 8 drops in the tub
Body Oil, 5-10 drops in 1 oz. carrier oil
Body lotion/cream, 5-10 drops in 1 oz. lotion
Compress, 3-5 drops in 4 oz. water
Face Oil, 25 drops in 1 oz. carrier oil
Inhalant, 6-10 drops on paper towel or 3-5 drops in hot water
Massage Oil, 15-30 drops in 1 oz. carrier oil
Perfume, 15-30% essential oil to 70-85% alcohol
Spray bottle with 8 oz. of water add 40-80 drops.
I put about 40 drops in an 8 oz. spray bottle with water and it works!! Before I found the Skeeter Beater, I used just tea tree oil in water in a spray bottle and it works, too! We get tons of mosquitoes where I live in Louisiana, and mosquito repellant is a must. Also, there were more cases of West Nile where I live, than anywhere in the US! These dilution rates are for any type of essential oil. Hope this helps!
Sally B.