Yes, you can become your own colorist and successfully touch up gray roots! To start, match the root color to the swatch and apply barrier cream around the hairline before applying permanent dye to the roots for 10 minutes.
If needed, refresh the mid-lengths and ends, then draw through with the remaining dye for 5-10 minutes. Glosses can also boost warm or cool tones in balayage areas. Follow the timing carefully to achieve the desired results without damaging highlights.