Sawyer 20% Picaridin topical spray is effective for up to 12 hours against mosquitoes and ticks, and provides up to 8 hours of protection against biting flies, gnats, chiggers, and sand flies. The non-greasy, fragrance-free spray dries quickly and won't damage plastics or synthetic coatings — safe for use on clothing, backpacks, watches, sunglasses, fishing line, firearm finishes, and more.