What happens is with any color mixed with white, grey, light blue and other pastels,, the white pigment is lighter than the colored pigment, so when you spray it, the heavier dark pigments settle to the substrate, thus leaving a slightly lighter shade on the top. You will also see this happen when you spot touch up pastel colors, the edges will get darker and leave you with a ring around the repair unless you apply it semi dry, which with dope is a bad idea