I've used Sawyers spray from REI and also two kinds of farm/home Permethrin solution (which I had to dilute) on my HH for three years now with no problems.
I did have some slight odor from one brand of farm solution, but switched to a home-use Permethrin and it is pretty much odorless.
I treat my hammock and gear and clothing two or three times a year (no longer spray, now I soak for two hours per military instructions).
On my last hike, two of my hike partners had at least half a dozen ticks crawl on them at a lunch stop. I had none.