Nissan TK3, Sapphire Blue Poly. Paint Code TK3, Sapphire Blue Poly for Nissan. TK3, Sapphire Blue Poly 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.