Great product!
I use this product for covering my gray roots between coloring appointments!  I use a root brush to apply it.  I spray the product in a shallow dish (sushi soy sauce dish) and then load the root brush.  I apply the product to my roots!  It covers the gray really well until I wash my hair.  Then I reapply!  I have gone to my hair appointment with it still covering my roots and the color treatment goes right through it without having to remove the hair powder first.  The bottle lasts a good year for me.  I have dirty blond hair, almost light brown hair,  and the blondish works well for me.
Rating: 5 stars