COLOR CODE20 (1975) - Skyline BlueGMC Touch-Up Paint

The Look

Your 1975 GMC truck carries a shade that defined the middle of the Squarebody era. This color is an honest, utilitarian blue that lacks the pretense of modern luxury finishes. It was born for work, designed to look just as at home on a gravel road as it does in a driveway. Since your truck has likely spent five decades facing the sun, the original finish on your panels has almost certainly drifted toward a lighter, chalkier version of its former self. Because of this natural aging, the fresh paint in your hand will likely appear deeper and more saturated than the weathered sections of your cab.

Technical Details

This is a solid finish. You do not have to worry about metallic flakes or pearl mid-coats, which makes the repair much more forgiving for a beginner. However, solid blues are honest to a fault. They show every ripple, scratch, and thumbprint left in your primer. Without metallic particles to distract the eye, your surface preparation becomes the most important part of the job. If the metal isn't flat, this blue will highlight the flaw rather than hide it. The benefit is that you can apply it from any angle without worrying about the color shifting in the light.

Best Practices

Before you spray or dab GMC Skyline Blue (check for code 20 (1975)), you need to shake the container for a full minute to ensure the heavy blue pigments are fully mixed. You can find your specific paint code on the white Service Parts Identification sticker, which is typically glued to the inside of your glovebox door. Test the color on the included card to see how it sits against your aged paint. When you start the repair, keep the container moving in steady passes to avoid heavy buildup. Work in your garage or a patch of shade to keep the metal cool, and allow plenty of drying time between layers to ensure the finish hardens correctly.