The thymol products are not just designed for evaporation, but the spreading on the stuff also through contact with the bees as they try to rid themselves of the stuff. With that in mind, I would not put any essential oil in the hive. Put of few drops on a plastic sheet (food wrap) and watch how fast the stuff eats right through it. And I certainly would not suggest getting it on your hands.
I played around with various essential oils a few years ago when I was testing such things as lemongrass oil, thymol and menthol. I found it amazing that they would eat the rubber medical grade rings in the syringes I was using.