No matter how well you control your powder coating process, you will undoubtedly have defects that need to be reworked. Here are a few simple things that you should know before you make this defect worse and end up scrapping the part.
Before you can begin to figure how to fix a defect, you need to know what you are dealing with. Proper identification is priority number one. First, if the defect is so severe that it cannot be corrected for a cost that is less than the scrap value of the part, you should toss it out without reservation. Next, if the defect is a substrate metal flaw or fabrication mistake (i.e., metal scratch, dent, missing weld, etc.), repainting it is unwise, as it will not correct the problem. Send it back to fabrication for resolution. Finally, if the defect is related to the coating process (i.e., light paint, dirt, fisheye, crater, etc.), then proceed to the next steps: surface preparation and recoating.
Surface preparation procedures need to be matched to the specific coating defect. You have several options:
After surface preparation, the next step is to recoat the part. Here are your options:
In the event that you encounter a defect after powder coating your part, be sure to identify the defect, prep the surface and then pick a method to recoat the pat. Sometimes, no mater how well you control your powder coating process, a defect can occur. Knowing these simple steps can keep you from making the defect worse and having to scrap the part.
Nick Liberto, P.E.,
Shimi Pooshesh Kala Co. Taking the benefits of 30 years experience in Paint and composite industries, Shimi Pooshesh Kala Company (Chekad) was founded in 2000, in Ivanaky industrial zone, near Tehran-Iran. Chekad is active in production, commerce, import and supply powder coating, paint and composite materials. Chekad motto is acquisition in the field of its customer satisfaction through providing and supplying quality products and rendering satisfactory services.