GM WA4631, Horizon Blue, Glacier Blue. Paint Code WA4631, Horizon Blue, Glacier Blue for GM. WA4631, Horizon Blue, Glacier Blue for GM 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.
