Should the Original Paint Be Sanded Off Before Repainting?

[CamillaFitz]

When repainting the entire vehicle, it is not necessary to sand off the original paint; simply pay attention to color matching for the original painted areas. Key considerations for repainting: Color Matching: During paint mixing, special attention must be paid to color differences. Protective measures should be taken, covering all non-painted areas with newspaper or other masking materials. Also, pay attention to spray gun pressure and working environment conditions. Baking Time: The spray path should maintain perpendicular alignment with the workpiece surface. The distance between the spray gun and the surface typically ranges from 15 to 30cm, adjusted according to the surface angle. For wetter, darker, and thicker coatings, reduce the distance; for drier, lighter, and thinner coatings, increase the distance. Spray Angle: The spray gun should maintain a right angle to the surface and move parallel during automotive painting. The gun movement speed should be consistently maintained between 30 to 60cm/s. Tilting the gun or using arcing motions with variable speeds will result in uneven paint thickness, causing streaks and blotches. Movement speeds below 30cm/s may lead to paint runs.

[MacMiguel]

As someone who frequently does DIY painting, I've found that whether to remove the original paint depends on the situation. If the original paint is still smooth and crack-free, simply sanding the surface to help the new paint adhere is sufficient—it saves both effort and time. However, if the original paint is already bubbling or damaged, it must be completely removed; otherwise, the new paint will easily peel off. I remember the last time I repainted an old car, I didn't properly sand the original paint, and within six months, the new paint cracked, costing me more to redo it. Here's a little tip: use medium-fine sandpaper to sand evenly, avoiding excessive force that could damage the underlying layer. After applying the new paint, it's best to let it dry for 24 hours without touching it to ensure it sets firmly. These insights come from multiple experiences and can help you avoid common pitfalls.

[ReaganLynn]

After handling numerous paint jobs, I've learned that whether to sand the original paint depends on the vehicle's condition and the painting goals. For minor scratch touch-ups, only sand the damaged area to preserve the surrounding original paint, which saves costs. However, for a full-body repaint or severe original paint aging, completely removing the original paint is essential to prevent new paint layers from delaminating or wrinkling. Always prioritize safety by wearing a dust mask to minimize inhaling paint particles. After completion, polishing ensures a smoother finish. Here's a real-life example: a client skipped proper sanding to save time, resulting in new paint peeling after three months and costly rework. Careful preparation extends paint job longevity.

[BenjaminRose]

My car has had minor scratches, and the mechanic suggested removing the original paint area before repainting. He said that if not removed, the new paint would have difficulty adhering properly and could easily bubble or peel when exposed to rain or car washes. I've tried lightly sanding the surface myself with fine sandpaper and then spraying some matching paint, which worked okay, but for larger damages, it's better to consult a professional. Saving money is secondary; the key is ensuring the paint doesn't deteriorate and cause rust while driving. Before starting, ensure good ventilation and protect your skin from paint exposure. In short, choose the level of sanding based on the condition of the original paint.

[McPenelope]

When modifying my car, I pay attention to details. Before repainting, I always remove part or all of the original paint to ensure the new color is even and long-lasting. Skipping this step may result in noticeable color differences or premature peeling, affecting the overall aesthetics. I once spent two days completely removing the original paint from a car, but the result was smooth as new, making it worthwhile in the long run. A reminder on tool selection: use wet sanding with water sandpaper to reduce dust. After painting, add a transparent protective layer to prevent UV damage. Modifying without removing the paint leads to endless troubles and rework. Here's a tip: applying thin layers multiple times yields better results.