While The Great Cover Up Root Touch Up & Brow filler is rain, sweat, and pillow-proof, it is designed to be used as a temporary gray coverage tool and will wash out with your next shampoo. If you’re looking for a longer-lasting solution, we recommend our demi-permanent Root Reboot, which will cover gray roots for 2 weeks. You can still use The Great Cover Up Root Touch Up & Brow filler to cover any stray grays or to match brow color.