Types of Metal Finishes [10 Most Common Types Explained]

Want your CNC machined or 3D printed parts to look great and perform even better? The right metal finish makes all the difference. Whether you're aiming for sleek aesthetics, rust resistance, or long-term durability, Unionfab’s experts are here to help — and yes, the advice is free.

Introduction

Why Metal Finishing Matters?

Metal finishing isn’t just the cherry on top — it’s a vital step in getting your parts production-ready. A good finish can:

• Boost corrosion and wear resistance

• Improve part strength and longevity

• Add a polished, professional appearance

• Make parts easier to paint, coat, or assemble

From aerospace-grade durability to showroom-worthy shine, the right finish turns a good part into a great one.

What Is Metal Finishing?

Think of it as the final transformation for your metal part. Metal finishing refers to the surface treatments applied to metal to:

• Enhance performance (like resisting scratches, rust, or chemicals)

• Prepare it for other processes (like painting or plating)

• Give it a specific look or texture

Want to know how to request a quote for your preferred finish? Check out our Unionfab Finishing Quote Guide for step-by-step instructions on choosing a surface treatment — fast and hassle-free.

Common Types of Metal Finishes

Explore the most popular finishing techniques used in CNC machining and 3D printing — and discover which one best fits your project goals.

1. Anodizing

What it is: An electrochemical process that thickens the natural oxide layer on aluminum parts.

Why it’s great: Boosts corrosion resistance, adds surface hardness, and allows for vibrant coloring.

Where it’s used: Aerospace components, consumer electronics, automotive housings.

Unionfab Tip: Our anodizing service gives your aluminum parts a sleek, durable finish — in a range of color options.

2. Electroplating

What it is: A process that deposits a thin layer of metal (like nickel or chrome) onto your part using an electric current.

Why it’s great: Enhances corrosion and wear resistance while upgrading your product’s look.

Where it’s used: Connectors, trim pieces, and decorative parts.

Unionfab Tip: We offer tailored electroplating options to match your performance and aesthetic requirements.

3. Sandblasting

What it is: A high-pressure stream of abrasive material cleans or textures the surface.

Why it’s great: Removes imperfections, adds a consistent matte finish, and preps parts for painting or coating.

Where it’s used: Industrial machinery, automotive parts, prep for coatings.

Unionfab Tip: Use sandblasting for optimal surface prep — we’ve got you covered.

4. Powder Coating

What it is: A dry powder is applied and baked onto the surface, forming a hard, colorful finish.

Why it’s great: More durable than paint, with countless textures and colors.

Where it’s used: Outdoor gear, consumer products, and furniture.

Unionfab Tip: Ideal for both CNC and 3D printed metal parts — when you need protection and personality.

5. Polishing

What it is: A mechanical process using abrasives to achieve a mirror-smooth finish.

Why it’s great: Elevates appearance, improves cleanliness, and reduces surface roughness.

Where it’s used: Medical devices, kitchenware, premium consumer goods.

Unionfab Tip: Our precision polishing is perfect for projects demanding a flawless look and feel.

6. Brushing

What it is: Creates a uniform, linear surface texture using abrasive brushes or belts.

Why it’s great: Hides fingerprints and scratches while offering a clean, satin look.


Where it’s used: Appliances, signage, automotive trim.


Unionfab Tip: Brushed finishes are especially beautiful on aluminum and stainless steel — and we do both.

7. Painting

What it is: Liquid paint is sprayed or brushed on, then dried or baked to cure.


Why it’s great: Custom colors, added protection, and smooth finishes.


Where it’s used: Consumer electronics, industrial machines, vehicle parts.


Unionfab Tip: Painting is a versatile option for prototypes or final products — and we’ll match your vision exactly.

8. Vapor Polishing

What it is: A chemical vapor gently melts the surface of plastic parts, leaving a clear, glossy finish.

Why it’s great: Delivers near-optical clarity and dramatically smooths rough prints.

Where it’s used: Transparent enclosures, optical components, medical parts.

Unionfab Tip: Especially effective for SLA and SLS prints needing a glassy, high-end finish.

9. Electrochemical Polishing

What it is: A precise method that removes a thin layer of metal via electrochemical reaction.

Why it’s great: Produces an ultra-smooth, shiny surface and improves corrosion resistance.

Where it’s used: Food-grade parts, surgical tools, aerospace components.

Unionfab Tip: Choose electro-polishing when surface purity and hygiene are a top priority.

10. Heat Treatment

What it is: Controlled heating and cooling that changes the internal structure of metal to enhance strength and durability. 


Why it’s great: Improves hardness, toughness, and fatigue resistance without altering shape. 


Where it’s used: Gears, tools, engine parts, structural components. 


Unionfab Tip: Our heat treatment service boosts the mechanical performance of CNC parts where it counts.

Unionfab’s experienced engineers are ready to assist you in selecting the most suitable metal finish based on your project specifications and budget.

How to Choose the Right Metal Finish?

Selecting the appropriate metal finish depends on your specific project requirements. Consider factors such as appearance, corrosion resistance, wear resistance, and cost. Here is a simple reference:

Still unsure? Unionfab’s experts can guide you to the best choice based on your design, material, and intended use.

Need personalized advice? Talk to Our Experts Now!

Why Unionfab Is Your Go-To for Metal Finishing

At Unionfab, finishing isn’t an afterthought — it’s an essential part of delivering parts that perform as good as they look. Whether you’re prototyping or scaling up production, we combine technical expertise with tailored finishing services to bring your vision to life.

What Sets Us Apart:

• End-to-End Service: From CNC machining and 3D printing to a full suite of finishing options — including anodizing, powder coating, electroplating, polishing, and more — we handle it all under one roof.

• Consistently Fast Turnarounds: Get high-quality finishes without sacrificing speed. Our streamlined workflow ensures timely delivery, every time.

• Expert Guidance, Personalized Support: Not sure which finish fits your part or application best? Our specialists are here to help you choose the ideal material and surface treatment.

• Scalable for Any Project Size: Whether you’re producing a single prototype or thousands of end-use parts, we offer flexible solutions to meet your exact volume and customization needs.

Trusted by 30,000 engineers, designers, and manufacturers worldwide, Unionfab delivers the precision, durability, and visual appeal your products deserve.

Final Thoughts

The right metal finish does more than just look good — it enhances your product’s performance, longevity, and user experience. By understanding the available finishing options, you can make smart, strategic choices that align with your design, functional, and production goals.

Whether you're aiming for superior corrosion resistance, increased surface hardness, or a premium visual finish, there's a solution that fits — and Unionfab is here to help you find it.

Get Expert Advice & a Free Quote

Not sure which metal finish is right for your part?
Let our experts guide you.

✅ Contact Unionfab to discuss your project


✅ Request a Free Quote and bring your design to life with the perfect finish

✅ Read our Finishing Quote Guide which walks you through the entire quoting process

From concept to completion — we’ve got your finish covered.