Have you tried out picaridin based bug repellent? We’ve been using picaridin based bug sprays on our entire family (kids and adults) for quite a while and we are completely satisfied. Picaridin is safe on kids over 6 months, if applied properly. It doesn’t ruin clothing and gear or have the odor like DEET and the 20% strength lasts all day. Natrapel makes the all-day strength, but it is available in other brands of varying strength (see Amazon for more)