![]() ![]() However, if your pretreat system uses zirconium, don’t go bonkers with it. If you are working on an aluminum substrate, you need to sand the oxidization away, and if there are any marks (like writing) still on any substrate after a pretreat you will need to go in and grind it down – plus another pretreat - to prepare the newly bared surface. The key to preventing blushing is to keep a close eye on your pretreatment process. If your coating is light in color, these marks will show through starkly, and if that's the case, the coating won’t be the only thing blushing! Another factor that can cause blushing is aluminum oxidation. Anything on the surface, from the ink of a marker to the residue left behind from stickers and stamps, can telegraph through the coating. This is caused by a number of factors, the most common being an improper pretreat. These marred sections can be large, small, and anything in between. You’ll probably notice that you'll have one spot where it's perfectly fine, and then you'll have another area that you'll see this blushing or telegraphing. This short, 3 minute training video explains blooming and how you can avoid it! Blushingīlushing (sometimes also called telegraphing) is when a substance pulls through the coating from the substrate, discoloring the finish. It is a common problem, that thankfully, is pretty easy to solve. Or, chat to your powder coatings supplier about the different product possibilities with different resins. Crank up the temperature, especially for thicker substrates, so that the metal heats up faster and the part and powder gets to a higher temperature quicker. ![]() You can prevent blooming by carefully managing your oven. Luckily, most of the time this ‘fog’ like, white powdery residue can be wiped off with a wet cloth. Occasionally, high humidity causes, or contributes, to blooming as well. Blooming is usually caused by either a poor resin – and if that's the case, the only thing to do is to talk to your powder supplier about using a better resin (which will likely also be more expensive!) or when a coating is cured at too low of a temperature, especially when the metal is on the thicker side. Blooming looks like a foggy, hazy or smoky distortion in the resin, and if it does occur, shows up more noticeably on blacks, dark blues, dark greens, or, dark substrates. Understandably, this occurs more so with cheaper resins. They come in all shapes and sizes, and in this guide, we are going to cover the different types of defects, how they occur, and how to prevent them.Ī lot of the time, blooming occurs when there are issues with the resin. Pulling a part out of the oven only to see disappointing orange peel spoiling the powder coated finish, sections where the coating has sagged, or opacity issues, bring a sigh of frustration, alongside the question of what happened?Īppearance issues are those immediately visible defects found after a cure. Rejects are the bane of any job shop’s existence when applying powder coatings. Display IFS Powder Colors with our WallboardsĪppearance Issues: When Powder Coating Jobs Go Wrong. ![]()
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