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How to Get Powder into Recessed Areas
Q. We manufacture metal office furniture. Our pedestal file cabinets have drawer pulls formed into the front of the drawers as recessed areas that are about ¾" wide by 1" deep. We use automatic spray guns to coat the outer surface and then manual sp...
Ask an Expert Published: 2/1/2017
Testing Clinic: Correcting Changes in Part Shape
Q. I frequently need to measure the thickness of anodize, paint and powder coatings on many differently shaped aluminum parts. I see the part shape and sometimes the aluminum type can affect the measurement value. What’s the best way to correct chan...
Ask an Expert Published: 2/1/2017
How to Stop Rust
Q. We make automated pay stations for parking lots, the machines that allow the customer to pay at the exit with a credit card or cash. We have had some problems with rust breaking out of the seams at the base and around the door panels that provide...
Ask an Expert Published: 1/1/2017
Powder Coating Clinic: Adhesion Problems on Chromated Zinc Plating
Q. We have had adhesion issues when powder coating over zinc-plated aluminum. The aluminum had been nickel-flashed and zinc-plated with a hex-free chromate to meet RoHS compliance. Do you have any suggestions as to why the powder will not adhere pro...
Ask an Expert Published: 1/1/2017
Powder Coating Clinic: Solving Problems with Color Variation
Q. We are noticing differences in the color of parts coming out of the oven. It seems to happen more on some days than others. It can happen with any of our brighter colors like orange and red but does not seem to happen with more neutral colors lik...
Ask an Expert Published: 12/1/2016
Powder Coating Clinic: Oil Seeping out of Large Welded Tubing
Q. We have a large part made out of tubing that is welded together. The tubing has a lot of oil seeping out of the welds when the part is heated and causes a defect in the cured film. We cannot get the oil out of the tubing in our washer. We tried c...
Ask an Expert Published: 12/1/2016
Powder Coating Clinic: Touch-up Options for Powder Coated Parts
Q. I’ve been told that a powder coated part cannot be “touched-up.” I have some patio furniture that I had powder coated and the powder coating shop that did the work for me stripped the threads in holes used to rack the part. I can fix the threads ...
Ask an Expert Published: 12/1/2016
Powder Coating Clinic: Powder in Layers
Q. We are in the process of designing a new powder system for aluminum extrusions and building panels. Our current system uses a six-stage dip pretreatment process and a three-layer liquid paint process (prime, color coat, clear coat) that meets AAM...
Ask an Expert Published: 12/1/2016
Powder Coating Clinic: Making Powder Lines More Profitable
Q. We run a job shop powder coating operation with a conveyor system that runs at around 4 to 6 fpm, depending on what product is hung. We are putting through a lot of work, but our profits are not great. Can you suggest how to improve the efficienc...
Ask an Expert Published: 12/1/2016
Powder Coating Clinic: Avoiding Rust on Parts
Q. We apply lighter colors of powder to our ticket machines for parking lots. Some go into covered garages, but many of them are exposed to the outdoor elements. We have some problems with rust around the base of the machines and also on corners. We...
Ask an Expert Published: 11/1/2016

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