Powder coating different types of materials can be a great way to apply a protective finish to your product. Still, some items are less compatible with this process. Plus, many products receive more benefits from alternative or no coatings.
As a general rule, anything that can hold an electrostatic charge and withstand the heat of the curing oven is a candidate for powder coating. Most curing ovens run at about 400 degrees Fahrenheit, so whatever goes into that oven needs to have a melting or burning point higher than that...