93/630H - White Diamond Pri Metallic Tri-coat GMC Touch Up Paint

The Look

This isn't a basic refrigerator white. It represents the high-end luxury finish GMC reserved for special models at the turn of the millennium. Since your vehicle was part of that 2001 limited run, you are dealing with a color that has far more character than a standard fleet truck. It has a warm, creamy depth that glows rather than glares. Under the sun, the metallic flakes create a soft shimmer that makes the body lines look thicker and more expensive. It is a sophisticated choice that still holds its own against modern luxury finishes.

Technical Details

The "Pri" in the name confirms this is a pearl tri-coat finish. This means the color isn't just one layer; it relies on a translucent middle coat to create that signature depth. The risk with this finish is the "build." If you apply the mid-coat too heavily, the repair will look darker or more yellow than the rest of the panel. If you go too light, it will look like a flat, dry white. You are essentially balancing light and transparency, so getting the flow right is the difference between a professional look and a noticeable patch.

Best Practices

Before you spray or dab GMC White Diamond Pri Metallic Tri-coat (check for code 93/630H), you need to shake it for 60 seconds to ensure the pearl pigments are fully suspended. You can find this code on the silver Service Parts Identification sticker, usually tucked inside your glove box. Test the color on the included card to see how many layers of the mid-coat you need to reach the right level of glow. Whether you are using a nozzle or a brush, keep the container moving to prevent the metallic flakes from bunching up. Work in your garage or a patch of shade, and give the paint plenty of drying time between thin layers to avoid any cloudiness in the finish.