Mineral Metallic (WA433B/GJB) Touch-Up Paint for GMC

The Look

Your Sierra or Yukon carries a specific kind of industrial weight with this finish. It is a mid-tone gray that feels more substantial than a standard silver, giving models like the Acadia and Canyon a rugged, professional appearance. Since this color was only available for a short window between 2017 and 2018, it is a bit rarer than the usual shades you see in the parking lot. It hides road dust well, but because your vehicle has likely seen plenty of highway miles, the original finish might have slightly shifted from its factory-fresh depth due to sun exposure.

Technical Details

This is a metallic finish, which means it relies on a heavy load of silver and mica flakes to create its signature look. The biggest challenge you will face during a repair is mottling. If the paint goes on too thick or if the spray distance is inconsistent, those metallic flakes will huddle together and create dark, cloudy patches that look like shadows. To avoid these stripes, you must ensure the flakes lay down flat and even across the surface. This is a basecoat-heavy color, so it will look dull and slightly textured until you apply a clear coat to bring out the sparkle.

Best Practices

Start by checking for your code on the silver Service Parts Identification sticker located inside the glove box or on the driver's door jamb. Before you spray or dab GMC Mineral Metallic (check for code WA433B/GJB), you need to shake it for 60 seconds. Shaking is non-negotiable for a metallic because those heavy flakes sink to the bottom of the container. Test the color on the included card to see how it sits against the current state of your paint. When applying the paint, keep the container moving in steady, even strokes. If you linger on one spot, the paint will pool and the metallic particles will look muddy. Allow plenty of drying time before you move on to your final clear coat.