I just crackle painted an entire wall of my family room with the R.L.kit. I adore the results as far as look and texture goes, but I don;t like the dark color. I want to do the same technique, but in a much lighter color. How would I go about doing it? Does the original crackle surface need to be sanded (oh NO!) or can I just paint right over it? I am scared to really screw it up.