What causes the peeling of layered paint? The three barriers to interlayer adhesion.
The base is fine, but only the repaired layer is peeling off. The hardened paint film does not adhere. Surface preparation and time management will be the turning point.
Although there is no problem with adhesion to the substrate, only the layered coats are peeling off. The complete curing of the primer, on the contrary, is causing the peeling. Repainting after complete curing results in adhesion strength being less than half. ────────────── ■ Cause of Occurrence The cured paint film has no reactive groups left, making it impossible to chemically bond with the topcoat. Due to the smooth surface, there is also no mechanical grip. ■ Truth The longer the waiting time, the easier it is to peel off. Oils or hand grease that adhere after baking create a thin film between the layers. ■ Improvement Measures Before repainting, perform surface sanding and degreasing before applying paint. If the condition is poor, it is more reliable to completely strip the paint film and repaint from the substrate. Please utilize the materials summarizing the management standards for repair painting and interlayer adhesion.
basic information
Compatible materials: Iron / Stainless steel / Aluminum / Aluminum die casting / Zinc die casting / Compatible processes: Coating removal, substrate adjustment, surface preparation, degreasing, repainting / Capable of complete removal of existing coatings / Monthly production of 300,000 units, 100 types, 30 colors / ISO 9001 certification obtained.
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Applications/Examples of results
Color change of unsuitable painted products, repair painting, and re-finishing of recoated items. Comprehensive support from complete stripping to substrate regeneration and repainting.
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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.