i do sometimes use premetrol on field pants but honestly what i find most helpful is light colored pants and constant tick checks. I won’t get them all that way but most i do. That way you also really learn where the ticks are, which helps you calibrate your instincts for when to be most careful, or sometimes to avoid walking a route in a ‘ticky’ spot when there’s another option.
But i am not in as bad an area as some of you.