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A Guide to Finishing Techniques for CNC Plasma Cut Projects


So, you've just wrapped up a CNC plasma cutting project, awesome! Your CNC plasma table has done the heavy lifting, slicing through metal like it’s nothing, and your piece is really coming together. But let's be honest—the job's not over yet.


If you want your project to shine and have that professional touch, you need to focus on what comes next: finishing.


Whether you’re creating custom signs, metal art, or industrial parts, the right finishing techniques can make a difference between a rough piece and a polished masterpiece ready for display. That’s why in this guide, we’ll take you through some essential finishing methods that every CNC plasma cutting enthusiast should know.


Grinding and Deburring for Clean, Professional Edged Results From Your CNC Plasma Cutter

After your CNC plasma cutting machine has finished its job, chances are, you'll be left with some slag or burrs—those rough, raised edges that can be a bit of a hassle. But taking the time to grind them off not only makes your project safer to handle but also gives it that smooth, professional look we all want!


Tools and Techniques for Grinding and Deburring


Angle Grinder

This is your go-to tool for tackling those rough, jagged edges. Just attach a grinding disc, and you're all set to give your plasma-cut projects a clean finish. It's like magic in your hands!


Deburring Tool

We all know those tricky spots that a grinder just can’t reach. This is your tool right here! This handy gadget is perfect for precision work, letting you get into those hard-to-reach areas without breaking a sweat. Game changer for those fine details!


Sanding Flap Discs

Why choose between grinding and sanding when you can have both? These discs pack the power of an angle grinder while offering the finesse of sanding. Perfect for smoothing out edges after you’ve done the deburring dance.


And remember, smooth edges aren't just about aesthetics—they're a safety feature. You don’t want someone slicing their hand on your work after all that effort, right?


Sanding and Surface Prep Before Painting or Coating Your CNC Plasma Project


Awesome, you’ve cleaned up the edges, and now it's time to prepare the surface!


Note: If the surface of your metal isn't prepped correctly, your finish won't adhere well, and you'll be looking at peeling paint or uneven coatings down the road.


Hand Sanding or Power Sanding 

This step helps you get rid of any surface flaws like scratches, rust, or mill scale that might have built up over time. If you’re working on larger pieces, a random orbital sander can really save you time and effort. It sands evenly without leaving those annoying swirl marks!


Chemical Degreaser 

Before you start painting your project, make sure to give the surface a good wipe-down with a quality degreaser. This step is key to making sure no oil, grease, or dirt could mess with how well the paint sticks.

Also, degreasers break down any gunk and leave the surface nice and clean, which also means your paint will go on smoothly and evenly, leading to a finish that looks great and lasts longer.


Blasting (Sandblasting or Soda Blasting) 

Now if you're dealing with larger pieces or stubborn mill scale, blasting the surface can be a game-changer. Both sandblasting and soda blasting are awesome for removing unwanted materials and creating a nice, even texture.


Blasting not only cleans the surface but also helps it to better accept coatings, giving you that professional finish you’re after. This prep work is perfect for making sure your paint or powder coating sticks well, boosting both the longevity and the look of the final product. 


Customizing the Look: Ways to Age or Customize Your Metal

Not every project needs to look like it just rolled off the assembly line. Sometimes, a worn, rustic look is exactly what you're after.


Patinas 

Have you ever noticed how some metals develop beautiful, rich colors over time? That’s the magic of patinas! These are fascinating chemical reactions that transform the surface of the metal, creating those stunning hues. Take copper, for instance; it can turn a gorgeous turquoise green that catches the eye.


And steel? It can take on a warm, deep brown that adds character to any piece. By applying it, you can easily give your work that charming aged, weathered look while keeping the integrity of the material intact. It’s like giving your metal a personality!


Rust Effects 

Looking for that perfect industrial vibe? Intentionally rusting your metal can give your project a unique, distressed appearance that’s all the rage.


To achieve this look, simply mix hydrogen peroxide, vinegar, and salt, and apply it to your steel. It’s a quick and effective way to create that sought-after rusted finish that adds depth and a story to your work. Plus, it’s also a fun project that lets you experiment with textures!


Heat Patinas 

Want to add a splash of color to your metal creations? Try using heat!


With a simple torch, you can create an array of vibrant colors on steel, ranging from rich blues and purples to warm bronze and gold tones. This technique is perfect for adding flair to decorative pieces or unique metal art.

Imagine the stunning effect you can achieve—your creations will truly stand out!


Finishing CNC Plasma Cut Project with Powder Coating and Painting: DIY vs Professional Options


Now that your project from your trusted CNC plasma cutter table is prepped, it’s time to decide on a finish. While painting is a classic option, powder coating is becoming increasingly popular thanks to its durability and professional-grade results.


But should you go DIY, or hire a professional?


Painting

DIY

Are you feeling crafty? You can totally paint your CNC plasma cutting projects yourself! Just grab the right materials and you’re good to go!


A  good primer is a MUST here—especially on bare metal—to create that perfect foundation. And remember, applying multiple thin coats will give you that smooth, professional finish you’re after.


Professional

Now, if you're dreaming of a high-gloss, automotive-grade finish that really stands out, you might want to consider hiring a professional painter. They have access to top-notch tools like spray booths and high-end automotive paints that can elevate your project to the next level.


Also, letting the pros handle it might just be worth the investment, especially if you want that flawless shine!


Powder Coating

DIY

Interested in a DIY challenge? Well, there are already kits available, but keep in mind you’ll need access to a big enough oven to bake your piece. The beauty of powder coating is that it gives you a durable, protective finish that outlasts regular paint.


Professional

If your project is on the larger side or if you're aiming for a pristine finish, going with a professional might be your best bet here. They utilize industrial ovens and high-tech electrostatic spraying equipment to ensure an even coat every time.


And if you’re working on something that needs maximum durability—like outdoor furniture or machinery parts—it's worth considering their expertise to achieve that perfect, long-lasting finish.


In the end, whether you choose to paint or powder coat, both options can dramatically enhance the look and lifespan of your project. It's all about figuring out your budget and the level of durability you want.


Finish Like a Pro with FastCut CNC Plasma Tables

At FastCut CNC, we don’t just provide high-quality CNC plasma cutting machines and tables—we're here to support you through every step of your project--from cut to finish.


Ready to get started on your next CNC plasma cutter project?


Call us today to find the perfect plasma table for your workshop, or to talk about how our machines can help you achieve professional-level results on every project. It’s time to cut clean and finish strong—let FastCut CNC show you how it’s done.

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