It does a good coverage of the grey hair and has a long-lasting effect. Be careful, though, if it gets on the clothes because it does not go off them easily.
I tried this while trying to extend my next hair-dye session. I used it as per the label to the point, and when done my hair looked tacky, sticky and it wasn't what i expected. I had to wash it in some 3 hours because i felt it too heavy on my head. the color did cover the greys, but it was the hair's look that was painfully uncomfortable and dry. Although it is affordable and it does help to have distances between the hair-coloring sessions, but this product didn't help me there, and i won't be using this product except in Extreme circumstances.