If you're using a temporary cover-up, like the Root Touch-Up Spray, you should reapply after each shampoo. You can also reapply before if needed but be careful not to apply too many times without washing in between to avoid build-up – just like you would with hair spray.

Be sure to saturate your most visible roots with color. Once your done applying the color, set your timer for 10 minutes. Tip: If your grays are really stubborn, leave color on for up to 15 minutes. Make sure to cover roots at hairline, part and temples.

Or if you're using a light blonde shade. It may be necessary to leave color on for up to 15. Minutes the last rinse hair with warm water until the water runs. Clear style as usual no need to shampoo.

I don't think you should shampoo after coloring. Shampoo before coloring, wait for hair to completely dry, then color (roots or whole head), wait the appropriate time for the color to sink in, then wash your hair (without shampoo), then use the conditioner (preferably the Clairol one) on it, then that's it.

Most people do retouch roots every 4 to 6 weeks, and it's a good rule of thumb to make sure you don't go more than 8 weeks between sessions. This is because you want to make sure that your roots don't get any longer than an inch, and according to All Things Hair, hair grows about half an inch every month.

Other Root Touch-up Products We Recommend

• Madison Reed Root Touch-Up Powder.
• TRESemmé Root Touch-Up.
• L'Oréal Magic Root Precision Temporary Gray Hair Color Concealer Brush.
• Rita Hazan Root Concealer Touch-Up Spray.
• R+Co Bright Shadows Root Touch-Up Spray.
• dpHue Color Touch-Up Temporary Color Spray DPHUE.
• Bumble and Bumble Bb.

The answer to this age-old question requires considering many factors. But the short answer is about every 4 to 8 weeks to touch up the roots from an overall hair coloring job. But if you have had just highlights, lowlights, or balayage coloring, you can recolor as the shades grow out from your hair.

Leaving the hair dye on for too long can cause significant damage to your hair. Always test the hair dye on a small section of your hair before applying it to your entire head. Furthermore, you can take care of your hair by using a intense conditioning treatment after a root touch-up.

And you can store what's left over conveniently. Until your next root touch-up mix. The creme and developer. You want a nice even consistency. So keep mixing it until it looks really creamy.

Wash your hair 12 to 24 hours before your color. This will assure the hair is clean, but allow the oil in your scalp to create a protective barrier against irritation and staining.

Many professional hair colorists strongly recommend waiting as long as possible before getting hair wet or wet washing. As a bare minimum you should wait at least 3 days or 72 hours. It's important to give the hair color time to set so that it won't fade as quickly.

DON'T: Wash Your Hair the Next Day "I recommend clients give their hair two to three days to let their new color truly set in," says Pineda. While washing your hair the next day doesn't necessarily do any harm to your hair or color, waiting it out may offer an added boost for longer hold.