How To Color Epoxy Resin Using Pigment Pastes

Adding color to epoxy resin can transform a simple project into a vibrant work of art, but choosing the right colorant is key. While powders and inks are popular, pigment pastes offer unmatched color saturation and consistency for professional-looking results. They are specifically designed to blend seamlessly with resin, providing rich, opaque tones that make your projects pop. Learn how to color epoxy resin using pigment pastes to achieve stunning, consistent color every time.

Understanding Pigment Pastes

Pigment pastes are highly concentrated colorants suspended in a resin-based solution. This composition allows them to mix into epoxy resin flawlessly without altering the resin’s chemical balance or curing process. Unlike dyes that create transparent color, pastes produce solid, opaque results that are perfect for projects requiring deep, uniform hues.

Because they are so concentrated, a little paste goes a long way, making them a cost-effective choice for hobbyists and professionals. Their thick consistency also prevents the color from settling or creating streaks, which can be an issue with powdered pigments. This ensures your final piece has a smooth, even color distribution from edge to edge.

Essential Supplies for Your Project

Before you begin mixing, gather all your supplies. Having everything within arm’s reach prevents frantic searching once you’ve started working with the time-sensitive resin.

Here is a basic checklist of supplies you will need to get started:

• • Two-part epoxy resin and hardener.
• • Pigment pastes in your desired colors.
• • Silicone mixing cups and stir sticks.
• • A digital scale for accurate measurements.
• • Your project mold or surface.
• • Gloves, safety goggles, and a respirator mask.

Preparing Your Epoxy Resin

When using epoxy resin, work in a well-ventilated area to avoid inhaling potentially harmful fumes. Properly mixing your epoxy resin is the most critical step for a successful project. Always start by reading the manufacturer’s instructions, as mix ratios can vary between brands. Typically, you will mix the resin (part A) and hardener (part B) in a specific ratio by volume or weight.

Using a digital scale is highly recommended to achieve the correct ratio, as it provides the most accurate measurements. Pour the resin and hardener into a clean mixing cup and stir slowly but thoroughly for at least three to five minutes. Scrape the sides and bottom of the cup frequently to fully incorporate the two parts.

Mixing in the Pigment Paste

Once your resin is fully mixed, it’s time to introduce the color. Start with a very small amount of pigment paste, as it is extremely concentrated. A good rule of thumb for coloring epoxy resin using pigment pastes is to add no more than 5-10% of the total volume of your mixed resin. Adding too much pigment paste can disrupt the resin's chemical balance, which prevents proper curing and results in a sticky or soft finish.

Use a clean stir stick to scoop a tiny bit of paste and add it to your mixed resin. Stir gently until the color is evenly distributed and you have achieved a consistent, streak-free look. If you want a deeper shade, you can add more paste in small increments until you reach your desired opacity.

Achieving Custom Colors

Have fun experiment by mixing different pigment pastes to create your own unique shades! Start by blending small amounts of the pastes together on a separate surface before adding them to your main resin batch to preview the color. This technique allows you to create custom palettes for your projects, from earthy tones to vibrant pastels. Remember to keep track of your color “recipes” so you can recreate your favorite custom hues in the future.

Best Practices for Even Color

Achieving smooth, even color is one of the main advantages of using pigment pastes. To ensure the best results, thoroughly mix the paste into the resin. Any unmixed clumps of paste can create blemishes in your final cured piece.

If you are pouring a large project, consider mixing your color into a smaller batch of resin first to create a concentrated color base. Then, you can add this concentrated, colored resin to the rest of your clear batch. This method fully dissolves the pigment and distributes it evenly throughout the larger volume.

Creating Unique Resin Effects

Epoxy paste pigments are fantastic for creating solid colors, but you can also use them to produce stunning artistic effects. For a marbled look, pour multiple colors of resin next to each other in your mold and gently swirl them together with a stir stick. The thick consistency of the paste-colored resin helps keep the colors distinct, creating beautiful, defined lines.

Here are some other creative techniques you can try with pigment pastes in resin:

• • Cell formation: Add a few drops of a resin cell-creating additive to your colored resin for a lacing effect.
• • Dirty pour: Layer different colors in a single cup before pouring for a random, blended look.
• • Ribbon effect: Drizzle a thin stream of a contrasting color over your base color as you pour.
• • Color blocking: Use silicone mold dividers to pour different solid colors in distinct sections.
• • Negative space: Strategically leave some areas of your pour clear to create depth and contrast.
  

Troubleshooting Common Issues

Even with careful preparation, you might occasionally run into issues. If you notice soft spots or a tacky finish on your cured piece, it is likely due to an incorrect resin-to-hardener ratio or insufficient mixing. Unfortunately, this cannot be fixed, and you will need to redo the piece.

If your color appears streaky, it means the pigment paste was not fully incorporated into the resin. To prevent this, take extra time to stir and scrape the sides of your mixing cup.

Final Curing and Finishing

After pouring your colored resin, cover your project to protect it from dust and debris while it cures. Refer to your resin’s instructions for the recommended cure time, which is typically between 24 and 72 hours. Avoid moving or touching the project during this period to ensure a perfectly smooth surface.

Once fully cured, you can demold your piece and admire your vibrant creation. Depending on your project, you may want to sand the edges for a smooth finish or add a final clear topcoat for extra shine and protection. These finishing touches will give your project a polished, professional look that truly showcases the rich color of the pigment paste.

Bringing vibrant colors to your epoxy resin creations is both fun and rewarding when you use pigment pastes. Their consistency, color strength, and ease of use make them the top choice for all kinds of resin art and DIY projects. By following these steps, you can achieve smooth, eye-catching results.