Root Touch Up Hair Color Spray, 2 oz ( 57 g ) - Select Your Color. Description. Root Touch-Up Temporary Hair Color is water, sweat, and stain resistant and lasts until your next shampoo. This spray touch-up hair color delicately covers thinning patches so hair looks naturally full and beautiful. Benefits: Developed to easily blend with any hair color. Quickly conceals gray roots in seconds and adds volume at the roots. Suggested use: Shake touch-up spray well, hold can 4-6 inches away and spray onto roots using light, even strokes. Apply to hair.