What causes holes and dents in paint? How to distinguish between pinholes and skips.
Small holes and round dents may look similar, but their causes are different. This explains the points for distinguishing between pinholes and dents on-site, as well as the countermeasures.
A small hole has appeared on the painted surface. Upon closer inspection, isn't there a round dent mixed in instead of a hole? 【First, please look here】 □ A thin hole that looks like it was poked with a needle, with the base showing the substrate → Pinhole. Caused by gas or moisture within the material. □ A round dent with a raised edge and a thin center → Blister. Oil or silicone is present on the paint surface. □ Only the area around the hole has a different gloss → This is a mark left by foreign substances or debris that have burned off. 【Why distinguishing them is important】 Pinhole issues are related to the material and drying, while blisters are related to oil content. Since the causes are different, taking measures without distinguishing them will not yield effective results. 【Measures you can take starting today】 1. If it's a pinhole, review the pre-baking and water drainage drying processes. 2. If it's a blister, check for degreasing and inspect for oil or spray substances in the workspace. 3. Record the occurrence location on a diagram and see if it appears in the same spot on the parts. 【Free materials】 You can download a guide summarizing how to distinguish and address painting troubles for free from the related catalog on this page. Eiwa Kogei handles everything from pre-treatment like chemical film processing to baked painting.
basic information
Defective items: pinholes, edge defects. How to distinguish: shape of the holes, surrounding bulges, changes in gloss. Management items: air drying, water drainage drying, degreasing, management of oil content in the workspace.
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Applications/Examples of results
Burnt-on coating of metal parts with pinholes and defects. Appearance inspection by the quality control department, initial judgment of defects, training materials for new employees.
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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.