What it is: Diora Keratherapy Keratin Infused Fiber Thickening Spray What it does:Â What else you need to know: Keratin: Revitalizes the hairs natural protective layer adds strength restores elasticity and reduces breakage. Apply on dry hair only. Shake can well. Hold 3-6 inches (8-15cm) from hair and spray on balding and thinning area with a steady movement. Allow product to dry in hair 2-3 minutes.