

When it’s wet you should avoid getting it on bare skin, but once it’s dried it’s inert and you’re completely fine. The instructions say when you spray your dog or your clothes you should use gloves, but it dries pretty quickly. Usually about an hour for my dog (he’s double coated so it just takes a while for the undercoat to dry), but with most of my clothing I’ve sprayed it’s usually 30-60 minutes depending on the fabric.
With all that said, permethrin has long been approved for and used in lice shampoos, so it’s fine even against the skin, it’s just that it doesn’t work once it’s dry on the skin. All studies on permethrin show it to be entirely safe at the concentrations we use it at. It has to bind to fibers, but on skin it will break down quickly and be ineffective. It bonds to fibers really well though and is why it’s a longer term solution lasting weeks versus spraying harsh smelling deet that wears off in hours. For ticks it’s really the best solution.
Every time I go hiking with my dog I pull one of these little bastards off his fur. I cover him in permethrin, as well as every inch of my clothing, shoes and hat, so I’m not SUPER stressed about it, but it’s still annoying. A couple days ago I found one in his tail floof (he’s a golden so it’s a giant poof.) The tick was near dead already by the time I got it untangled from his fur thanks to the permethrin though. Usually I spot the ticks on him either because they’re on his head (where they’re easy to spot immediately), or because they got tangled in his fur and couldn’t jump off. I’ve never once seen one bite him thankfully.
It’s wild to me because I have only seen other kinds of ticks twice so far this season, but otherwise it’s all lone star ticks, which are not supposed to be the most common where I am. They’re definitely more prominent this year though. Of all the tick diseases, alpha-gal terrifies me the most, so I’m not thrilled by this increase in lone stars.