buy the concentrate and follow the general directions. When you are comparing look at the concentration of permithene, pyrathens and piper somethign or other. Added sunscreens help it last a bit longer, citronella oils may help it bond a bit to the hair.
equicare flysect Super-C concentrate, is a decent product,
I have also used Repel- XP concentrate then add permethene concentrate too it to end up with the same stuff. But it is simpler to buy the Equicare,
I use, "War Paint" inceticide around the ankles in the summer, it is kinda like a lotion. Stays on better than the sprays, I put gloves on then apply it with a damp small rag. couple swipes on each leg. The aplicator it comes in doesnt work to good.
Equicare Flysect Super-C