Every now and then we hear about a dear unsuspecting person who got caught off guard and used as a pin cushion for the No see-ums and Mosquitoes..... Both love me and probably always will, however they have not chased me from the island...... Most of the year I don't need anything at all other than to avoid undeveloped sandy places at dusk and dawn. However, during bug season the Sawyers Ultrathon works all day, it is a lotion applied once and forgotten about. In the event I get caught without it and get a few bites the two things that work immediately are Windex or Pure Rubbing Alcohol. Then a little Hydrocortisone over the next few days gets rid of the marks.... Hope this helps.