And it offers long-lasting safety towards ticks. Permethrin is a very completely different repellent compared with regular repellents, like those that contain picaridin and DEET. For one, permethrin is applied to clothes and kit , to not your skin. Once an merchandise is correctly sprayed, it holds repellency for about six weeks, or by way of roughly six washings. Unlike picaridin- and DEET-based sprays, permethrin is definitely an insecticide, so it could kill ticks instead of simply shooing them away.