GMC Bright Green Irid (568 (1974)) Touch Up Paint

The Look

Your 1974 GMC truck comes from an era where "subtle" was not in the design vocabulary. This color arrived right as the automotive world transitioned from the muted earth tones of the early seventies into the loud, high-impact palettes of the mid-decade. It is a unapologetic green that defines the rugged, boxy lines of a vintage Sierra or Jimmy. Since your truck has been on the road for five decades, the original finish has likely suffered from sun exposure and oxidation, meaning any fresh paint will look much deeper and richer than the weathered panels around it.

Technical Details

The "Irid" in the name is your clue that this is a metallic finish. It relies on thousands of tiny suspended flakes to catch the light, which gives the green its depth. Metallics are notorious for a phenomenon called mottling, where the flakes clump together to create dark spots or uneven stripes. If the paint sits too long, those heavy metallic particles sink to the bottom of the container. If you do not keep the pigments properly suspended, you will end up with a finish that looks blotchy rather than a smooth, uniform green.

Best Practices

On a 1974 model, you can usually find your paint information on the Service Parts Identification decal located inside the glove box. Before you spray or dab GMC Bright Green Irid (check for code 568 (1974)), you need to shake it for 60 seconds. This is non-negotiable for metallics. Once you begin, keep the container moving in steady, overlapping passes to ensure the flakes lay down flat. Test the color on the included card before moving to your truck to ensure the pigment is mixed well. If you are working in a garage or the shade, give each layer ample drying time to prevent the heavy green pigment from sagging or running.