Permethrin repellents can cause eye irritation, particularly if label directions have not been followed. Animal studies indicate that permethrin may have some cancer-causing potential. Permethrin is effective for two weeks or more if the clothing is not washed. Keep treated clothing in a plastic bag when not in use. If you decide to use any kind of chemical repellent, carefully read and follow all label directions before each use.
Every situation is different.
Ticks may be more difficult to repel than mosquitoes. Some pests are more active at certain times for example, many mosquitoes are most active between dusk and dawn. Ticks may be active at any time of day. Some places are more likely to have higher activity, too mosquitoes generally live in areas with brush and trees. Ticks prefer areas with tall grass, brush and trees.