Great concept but tricky to get right
I have a few stray grey hairs and also I have some leftover lightened pieces of hair throughout my hair that I thought I could easily touch up with this product and blend in to make my hair look more of an even colour all over. Alas, (while the concept of the product is great, practical and there is a definite need for it), I found the product tricky to use and get right. It was hard to apply to stray hairs and when I used it on my random light pieces even though I tried blending in by brushing through I still was not happy with the colour and I found it to be too noticeable and not natural looking. It was hard to get the coverage right and I preferred to apply it once I had put my hair into the style I wanted, but then I found the brush kept accidentally pulling on random hairs or bunching the hair.