I love my Joan Rivers Beauty Great Hair Day Fill-In Powder! I purchased it from The Shopping Channel. You need to match the colour to the shadow of your hair. I have very fine, thin hair. I use it every time I wash my hair to fill-in spots where my scalp shows through. It stays on until my next shampoo. Even when I use dry shampoo and rub it in, it doesn't budge! The product also lasts a really long time. I will repurchase.