Subtil Hair Make-Up Root Touch-up Spray. Touch-up spray to camouflage grey outgrowth in the hair. Application: Step 1: Make sure that your hair is properly dry. Step 2: Shake well before using. Step 3: Hold the spray up straight when spraying and at a 15cm distance from the scalp. Step 4: Spray onto the roots. Step 5: Wait 1 minute and your grey outgrowth will be camouflaged.