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Repair Mapping and Surface Preparation
Good blending starts before paint enters the cup. I first map the repair zone, the blend zone, and the clearcoat extension area. The repaired section must be blocked flat, sealed properly, and cleaned with the correct solvent system. Featheredges should be smooth enough that they cannot be felt with a gloved hand. Any sanding scratch, pinhole, or primer edge left at this stage will show through the basecoat and become more visible after clearcoat.
Color Check and Spray-Out Comparison
Before spraying the car, make a spray-out card using the same gun setup, air pressure, distance, and overlap planned for the job. Compare the card under daylight, booth light, and a color-corrected lamp. Metallic and pearl colors change with film build, orientation, and reducer speed, so I never rely on formula alone. A controlled lvlp spray gun Professional Automotive Tools process helps keep metallic orientation stable when transitioning from the repaired area into the original finish.
Basecoat Blending Steps
Start coverage over the repaired area, then reduce each pass outward into the blend zone. Keep the gun perpendicular and avoid arcing the wrist at the end of the pass. For metallic basecoat, I use consistent overlap and controlled distance to prevent striping. If orientation looks too dark or cloudy, adjust technique before adding more material. Overloading the blend area can create a visible halo after clearcoat.
Edge Fading and Clearcoat Extension
The blend should disappear naturally, not stop sharply. Use light control coats when necessary, but avoid dry overspray that lands rough on the surrounding panel. With an air spray gun, keep airflow stable and avoid sudden trigger snapping near the transition area. After the basecoat flashes, clear the full panel whenever possible. Full-panel clear gives better gloss uniformity and reduces the risk of a visible melt-in edge.
Quality Control After Application
Check the repair from several angles before baking or force drying. Look for mottling, dark edges, patchiness, and excessive texture. If the blend is wrong at the basecoat stage, fix it before clearcoat. After spraying, clean the gun thoroughly, especially the air cap horns and fluid tip. A partial blockage can change metallic orientation on the next repair and cause unnecessary rework.
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