Permethrin is the stuff you need. Then apply OFF to your skin. I cannot say it enough. DO NOT SPRAY PERMETHRIN ON YOUR SKIN!!! I know guys that apply it to clothes while they are wearing them, and I strongly recommend not doing that either. This stuff is carcinogenic.
Remember permethrin won't kill the ticks it just repels them, so I would suggest Deep Woods OFF 40% Deet applied to the skin. They make higher percentages of Deet but it's been proven that over 40% you see diminishing returns and higher health risks.
As a side note be aware of diseases ticks transmit. Lyme, Rocky Mtn Spotted Fever, amoung others. If your not aware of the warning signs. Google it, it could mean the difference between proper diagnosis and death!