What is the cause of peeling off quickly even after repainting? Removal of old paint film and rust.
Even if you repaint the peeled parts from above, they will peel again. The cause is the remaining old paint film and rust. The concept of stripping to avoid failure in repainting.
Even though I repainted the peeled areas, they peel off again after a while. Is that part just painted over the old layer? ────────────── ■ Cause of Occurrence The old paint film around the peeled area may appear intact, but its adhesion is weak. Underneath, rust spreads and lifts the new paint film. ■ Truth Even if you paint over it, it is only sitting on the weakened old paint film and rust. If the compatibility between the old paint film and the new paint is poor, shrinkage or lifting may occur immediately after application. ■ Improvement Measures The basic approach for repainting is to completely remove the old paint film and rust. After stripping, check the substrate and start over with degreasing and chemical treatment. Parts that are non-conforming or need a color change can also be painted using the same process as new ones after stripping. Eiwa Kogei handles everything from paint film removal through heat treatment and blasting to repainting. Please download and utilize the materials summarizing the key points for process verification.
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Defect: Peeling after repainting. Management items: Removal of old paint and rust, substrate inspection, degreasing, chemical treatment. Response: Consistent process from stripping to repainting.
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Reconditioning of defective painted items, color changes, and repainting of metal parts with rust. Materials for consideration by the purchasing department for waste reduction and the quality assurance department for handling non-conforming products.
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We are not just a "subcontracted painting factory." Established in 1958, our company has a foundation of painting technology and also specializes in chemical treatment, stripping, and cleaning, functioning as the "external surface treatment department" in your organizational chart. Based on our philosophy of "preparation is eight-tenths of the work," we emphasize participation from the "upstream process" before the drawings are finalized. We conduct test painting on a wide range of metals and difficult materials, and we produce the entire process from assembly, packaging, to delivery, thereby reducing your management workload. Additionally, by being able to perform zinc phosphate treatment in-house, we achieve stable painting quality. Furthermore, our micro-heating stripping technology, which does not use chemicals, maintains the electrical state of the "jigs (hangers)" that influence painting quality. Our approach of "pre-treatment determines painting quality" ensures the stability of the paint film during mass production. Rather than simply "applying specified standards," we work backwards to achieve optimal painting specifications and prevent scratches during transportation, sparing no effort in thorough discussions from the outset. This diligent preparation is the shortest path to preventing rework and minimizing total costs. From the development stage, please utilize the expertise of our specialists as part of your production line.