My hair is medium/long and blond and prone to damage. I like this product, the foam is wonderful it truly doesn't drip. I had no problem getting the color through all my hair. I've used it 3 times now. The color I use is 9N (Light Natural Blonde). Blonds though, be aware-go one shade lighter than the color you see on the box or it will be too dark. As for grays, I don't have too many yet, but I can say for me I had complete coverage of them. I will continue to buy this hair color, I like the foam, the color and the ease.