How factory paint matching actually works

Step 1: the paint code (and why it's not enough)

Every car has a paint code on the door jamb or under the hood. That gets you the formula the factory used on the day the car was built. But your car has been in Arizona sun for years — the roof and hood have faded more than the doors. A shop that sprays straight from the code gets a panel that's "right" on paper and visibly off next to the original.

Step 2: variants and the spray-out card

Paint suppliers publish several variants of each code (lighter, darker, more metallic). We spray the candidates on test cards, cure them, and hold them against your car in daylight to pick the closest one. Then we adjust from there. This is the step cheap shops skip because it takes an hour.

Step 3: blending

Even a perfect match has a hard edge if you paint one panel and stop. So we fade the new color into the adjacent panels — a door repair gets blended into the fender and rear door — and clear-coat the whole area. Your eye can't find where the repair starts. This is why a "one panel" repair is often quoted as three panels of paint: that's the blend, not padding.

What goes wrong at a cheap shop

• No spray-out card → color is a shade off.
• No blend → visible line at the panel edge.
• Not enough clear, or no bake → paint dulls or peels within a year in Phoenix heat.
• Poor prep → "fisheyes" and dirt nibs in the finish.

How long does paint take?

A single-panel repair with blend: 2–3 days including cure. Bumper: 2 days. Full-side or roof: 4–6 days. We'll tell you before you drop the car off.

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