Is there a difference between Tick Block and Permethrin SFR?
Yes. Tick Block is actually formulated to be used on clothing while Permethrin SFR has a completely different base and is formulated to be used on surfaces that will not contact skin for prolonged periods of time. While the active ingredient is the same, the carrier is different and using Permethrin SFR on clothing could lead to illness and skin irritations.
Answer last updated on: 03/08/2011