GM WA648H, Dark Otter (Wheel Color). Paint Code WA648H, Dark Otter (Wheel Color) for GM. WA648H, Dark Otter (Wheel Color) 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.