Last updated on January 31st, 2024 at 09:53 am
Powder coated sheet metal parts are durable, attractive, and the method is versatile which works well for many applications. In our shop, we powder coat aluminum, steel, and stainless steel parts with fantastic results.
With over two decades of experience in powder coating, we’ve learned that a little bit of foresight yields superior outcomes. Here are our top tips for powder coated sheet metal parts.
Table of Contents
- 1 1. Make Sure Your Part Can “Hang”
- 2 2. Account for Buildup
- 3 3. Clarify Specific Colors, Textures, and Sheens
- 4 4. Request Pre-Treatments When Needed
- 5 5. Insert Hardware after Finishing
- 6 6. Select a Single Color
- 7 Recommended Default Sheet Metal Tolerances
- 8 Powder Coated Sheet Metal FAQ
- 8.0.1 What materials can you powder coat, and what are the benefits of powder coating?
- 8.0.2 How can I prepare my parts for powder coating?
- 8.0.3 How does powder coating affect part dimensions, and how can I specify colors and textures?
- 8.0.4 When should I request pre-treatments before powder coating?
- 8.0.5 Can hardware be added before or after powder coating?
1. Make Sure Your Part Can “Hang”
When we powder coat your parts, we hang them on a rack, ensuring that all surfaces are exposed to allow for a uniform coat. There are a few different ways to prepare parts for hanging:
Many parts come to us with holes already drilled for hardware insertion. We can use the same holes to hang the parts for powder coating.
If your part requires powder coating and your design doesn’t already have holes, we recommend designing a 0.125” diameter hole in an inconspicuous area so that we can hang your part.
Break-off tabs or clips
It’s important to note that any holes added to a part won’t be plugged after powder coating. If a small but permanent hole isn’t an option, you can add break-off tabs with holes that can be removed after powder coating. Alternatively, if your part is small (6”-8”), it can hang from clips attached to the rack.
But keep in mind that with either of these approaches, some final touch-up will be required, which may increase your costs.
2. Account for Buildup
Powder coating adds approximately 0.003”-0.004” of buildup to a part, and it’s important to account for this buildup in your design.
Designs with tight hole tolerances, in particular, may require post-powder coating operations to open up the holes.
3. Clarify Specific Colors, Textures, and Sheens
The wide variety of powder coat options is one reason it’s such a popular finishing method. But the same color一even something as seemingly straightforward as “powder coat black”一can vary considerably among powder coat brands.
Calling out the exact RAL (color code), texture, and gloss for a specific brand is the
best way to ensure that your part will have the final appearance you desire. Note that although a RAL describes a unique color, the color may still vary slightly from one brand to another.
It’s also important to remember that if you’ve used a powder coat from a particular brand for your prototype, you should use the same powder coat during production to ensure consistency.
Finally, keep in mind that not all powder coat varieties are readily available, and some may have a high per-pound cost with a minimum buy that exceeds your needs. You may want to compare the availability and cost of a few types before making your final decision.
Locating color information
So, where can you find specific color information to share with your finisher?
Browsing color palettes on the websites of suppliers such as Cardinal Paint and Sherwin-Williams is a great way to start. Be aware, however, that colors may appear different online than in real life. To verify that you’re choosing the right color for your powder coated sheet metal parts, request physical samples from the supplier.
We are also happy to send samples of our house colors for your review. Complete our contact form for details!
4. Request Pre-Treatments When Needed
Treating parts with chromate or zinc before powder coating provides enhanced corrosion resistance, which may be necessary for parts that will be used in harsh environments or require electrical conductivity.
These treatments are added only upon request, so be sure to call them out if needed.
5. Insert Hardware after Finishing
Many types of hardware, such as panel fasteners and quarter-turn hardware, won’t perform properly when added before powder coating. If you’re wondering whether a hardware component should be added before or after finishing, our team is happy to advise you.
6. Select a Single Color
While applying multiple colors of powder coat to a single part is technically possible, doing so can be needlessly difficult, risky, and expensive. For example, the part can become scorched or incur unwanted paint residue from masking.
If you need a multi-colored part, wet paint is a preferable choice.
Why Choose Approved Sheet Metal for Powder Coated Sheet Metal Parts?
At Approved Sheet Metal, we provide sheet metal fabrication services and powder coating services under one roof, giving us full control of the entire manufacturing process and ensuring that you get high-quality parts quickly and cost-effectively. In fact, our in-house powder coating services save you about three days in lead time!
With robust capabilities for sheet metal finishing, we can fulfill your powder coating needs. Request a quote!
Powder Coated Sheet Metal FAQ
At Approved Sheet Metal, we can powder coat aluminum, steel, and stainless steel parts. Powder coating offers durability, attractiveness, and versatility, making it suitable for various applications. It provides a protective and visually appealing finish to your parts.
To prepare your parts for powder coating, you should ensure they can be hung on a rack for uniform coating. This can be achieved through existing holes, new holes, or break-off tabs or clips. Existing holes or designed holes (0.125" diameter) are common options, while break-off tabs and clips are suitable for smaller parts. Keep in mind that adding holes may require touch-up work, affecting costs.
Powder coating typically adds 0.003" to 0.004" of buildup to a part, which may impact tight hole tolerances. To specify colors and textures accurately, provide the exact RAL (color code), texture, and gloss from a specific brand. Remember that colors may vary slightly between brands. Consistency is key; use the same powder coat brand for production as for the prototype. Consider the availability and cost of powder coat types.
Pre-treatments like chromate or zinc are necessary for enhanced corrosion resistance in harsh environments or when electrical conductivity is required. These treatments are added upon request, so be sure to specify if needed to ensure the best results for your parts.
In most cases, hardware should be added after powder coating to ensure proper functionality. Certain types of hardware, such as panel fasteners and quarter-turn hardware, may not perform correctly if added before finishing. Our team can provide guidance on the appropriate timing for adding hardware.