Masking FAQs

Q. We are having issues with plug loss and leakage during coating. Rework is expensive – how can we mitigate this?

A. Excellent question! There are many factors that influence plug loss or leakage. Here are some recommendations for avoiding plug loss, leakage and rework.

Use the correct plug size
Incorrect plug size selection issues are surprisingly common, especially when manufacturers only convey hole or thread sizes to the purchasing department. In immersion or heat cycles, building pressure can trap large air pockets. If you do not select plugs with this problem in mind, a “perfect fit” on paper may be the wrong choice, and a slightly oversized option may prove better. Alternatively, if a...

Q – We use silicone masking caps and plugs in our powder coating line. After a few uses the paint builds up and begins to flake off during the subsequent wash cycles, contaminating the finish. How can we clean these to get the most use out of them?

A – This is a common question we receive. The answer is not as straightforward as it may seem. Just because you can clean them, should you? Let’s explore this a bit.

First, we never recommend chemically stripping masking materials. Depending on the cleaning agent used, it could damage or alter the mask – potentially changing its fit and, ultimately, effectiveness. Additionally, we have seen that if those cleaning agents are not...