What Paint to Use on 3D Printed Objects?

Getting into 3D printing painting opens up a universe of customization, allowing you to transform a simple plastic model into a work of art. If you’ve ever printed a model that looked a little bland, or wanted to add that “wow” factor, you’re in the right place. This guide will walk you through everything you need to know, from choosing the right paint to applying it for a durable, professional finish that makes your creations pop.

We’ll cover the best paints for common 3D printing materials, the crucial prep work that guarantees success, and the techniques the pros use. By the end, you’ll feel confident and ready to tackle your next project.

The Best Paints for 3D Printed Objects

The top paint choices for 3D printed objects are acrylics, enamels, lacquers, and spray paints—each suited to different needs and materials. Choosing the right paint is about more than just color; it’s the key to achieving the durability, appearance, and ease of application you want for your specific project.

Why Paint 3D Printed Objects?

You’ve already done the hard work of designing and printing your object. Why take the extra step to paint it?

• Aesthetics: The most obvious reason! Painting elevates your print from a single-color object to a vibrant, detailed piece. It’s how you bring a character to life or match a functional part to its surroundings.
• Protection: A layer of paint and a clear coat can protect your print from environmental factors like moisture and UV light, which can degrade materials like PLA over time.
• Customization: The possibilities are endless. You can match brand colors for a prototype, create realistic-looking props, or simply let your creativity run wild.

Paint Compatibility with Common 3D Printing Materials:

• PLA: Generally the easiest to paint. It works well with most acrylics and spray paints.
• ABS: Also easy to paint but benefits greatly from a primer designed for plastics. It’s a great candidate for durable lacquer paints.
• PETG: Can be a bit trickier due to its slick surface. Sanding and a good primer are non-negotiable for PETG.
• Resin (SLA/DLP): Resin prints have a very smooth surface that requires thorough cleaning and priming for paint to adhere properly.

Essential Surface Preparation for Painting 3D Prints

Ask any professional painter, and they’ll tell you: the final finish is determined by the quality of the prep work. This is the step that separates amateur results from professional ones.

• Cleaning: First, remove any dust, oils from your hands, or leftover residue from the printing process. A simple wash with soap and warm water followed by thorough drying is perfect.
• Sanding & Smoothing: This is crucial for hiding layer lines. Start with a lower grit sandpaper (like 120-200) to remove the most prominent lines and work your way up to a finer grit (400 or higher) for a smooth finish. For a really polished look, you can try wet sanding.
• Priming: Never skip the primer! A good quality primer does two things: it gives the paint a uniform surface to stick to, and it helps reveal any imperfections you might have missed during sanding. For best results, use a spray primer designed for plastics.

Types of Paint for Your 3D Printed Models

With a prepped and primed model, it’s time for the fun part. Here’s a breakdown of your best paint options.

Acrylic Paints

These are the go-to for most hobbyists. They are water-based, which means easy cleanup, low odor, and they are widely available in craft stores. They brush on smoothly and are fantastic for detailed work on PLA prints.

Enamel Paints

If durability is your top priority, enamel paints are an excellent choice. They dry to a hard, glossy finish that’s resistant to chipping. This makes them perfect for models that will be handled frequently or for creating a polished, metallic look.

Lacquer Paints

For a high-gloss, ultra-durable finish, look no further than lacquers. They are often used in the automotive industry for a reason. Lacquers are especially effective on materials like ABS and are great for functional parts that will see a lot of wear and tear.

Spray Paints

When you need to cover a large surface quickly and evenly, spray paint is your best friend. The key is to apply several light coats rather than one heavy one to avoid drips and preserve the model’s details. Look for brands that bond well to plastic.

Airbrush Paints

For advanced users seeking ultimate precision, an airbrush is the way to go. It allows you to create smooth gradients, fine lines, and incredibly even coats that are difficult to achieve with a brush.

How to Paint 3D Printed Objects: A Step-by-Step Guide

Ready to get started? Here is a simple, repeatable process for a great paint job every time.

1. Prep the Model: As detailed above, sand your model to remove layer lines, clean it thoroughly, and apply a thin, even coat of primer. Let the primer dry completely.
2. Choose Your Paint: Select the right paint based on your filament type and desired finish (e.g., acrylics for PLA, lacquers for ABS).
3. Apply the Base Coat: Using your chosen method (brush, spray, or airbrush), apply your main color. Remember to use thin, even coats.
4. Layer and Detail: Allow the base coat to dry completely before adding details with smaller brushes. This is where your model truly comes to life.
5. Drying Time: Be patient! Rushing the drying process is a common mistake. Refer to the paint manufacturer’s instructions for recommended drying times between coats.

Finishing Touches: Sealing and Protecting Your Paint Job

You’ve spent all this time creating a beautiful paint job; the last step is to protect it. A clear coat, or varnish, will seal the paint and protect it from scratches, dust, and UV damage.

• Matte Finish: Gives a flat, non-reflective look.
• Satin Finish: Offers a slight sheen, a great middle-ground.
• Gloss Finish: Provides a shiny, reflective surface that makes colors pop.

Apply the clear coat in the same way you applied your paint: with thin, even layers.

Common Mistakes to Avoid When Painting 3D Prints

I’ve learned a lot from trial and error over the years. Here are some common pitfalls to watch out for:

• Skipping Primer: I can’t say it enough. Your paint will not adhere well and will easily chip without it.
• Using Incompatible Paints: Putting lacquer over an uncured enamel can cause the paint to wrinkle and crack. Always check for compatibility.
• Applying Thick Coats: This leads to drips, loss of detail, and long drying times. Multiple thin coats are always better than one thick one.

Conclusion

3D printing painting is an incredibly rewarding skill that adds immense value and personality to your creations. By understanding the importance of proper preparation, choosing the right paint for your material, and applying it with patience and care, you can achieve stunning, professional-quality results. Now, grab that model you’ve been wanting to paint and get started!