Kiss Quick Cover Brush-In Color is perfect for covering roots and loose grays between hair colorings. Shampoos out easily. Won't mat or clump hair. Perfect for long hair, sideburns and mustaches STEP 1. Select one of Quick Cover Brush-In Colors six natural shades that closely matches your hair color. STEP 2. Apply color directly to the area that you want to touch up using light, short strokes. STEP 3. To remove, shampoo hair normally.