Yes, this product is a practical option for covering grey hair while giving your hair a more expressive color direction. Since it is a permanent oxidative dye, it can deposit color into grey hair, which is otherwise resistant to many temporary or semi-permanent products. The result will be pink, not a natural shade, so if you are covering grey, you should be comfortable with a pink tone.
Grey hair is often more resistant to color, so the final result may be less intense on grey sections than on your natural hair. To get a more even result, it is a good idea to do a strand test first. This will show you how the color takes on your specific mix of grey and non-grey hair. If your grey hair is very resistant, you may need to leave the dye on for the full development time, but never exceed the recommended time.
Remember that the metallic effect will also show on grey hair, so the grey sections may appear slightly cooler or more shimmering than the rest. If you want a more uniform pink, you may need to apply the color to all of your hair, not just the grey roots.