Nissan K13, Gray Pearl/Sapphire Slate. Paint Code K13, Gray Pearl/Sapphire Slate for Nissan. K13, Gray Pearl/Sapphire Slate for Nissan is formulated using R&E Low VOC Urethane Basecoat paint. The R&E Low VOC Urethane Basecoat paint exhibits exceptional color accuracy and excellent coverage and is specifically designed for all Automotive Refinish Applications.