Smashbox 24 Hour Photo Finish Shadow Primer, 10 ml, Eyeshadow Primers for Women, The Smashbox 24 Hour Photo Finish Shadow Primer eyeshadow primer promotes intense eyeshadow and makes it last perfectly. Characteristics: emphasises the colour of your eyeshadow prevents eyeshadow from smudging extends the perfect look of eye makeup How to use: Apply the primer in a thin layer to the entire lid and spread evenly. Continue by applying eyeshadow.