At Miller Coatings and Equipment, we help customers choose the right clearcoat and apply it properly for a flawless, professional look. This guide will walk you through the most common types of clearcoats, application best practices, and how to avoid or fix common problems like runs, orange peel, and cloudiness.
Why Clearcoat Matters
Modern automotive paint systems rely on a basecoat and clearcoat combination. The basecoat provides the color, while the clearcoat provides protection and gloss. Skipping the clearcoat can leave your color vulnerable to fading, scratches, and environmental damage. For metallic or pearl finishes, clearcoat is especially critical to bring out the sparkle and depth of the paint.
Types of Automotive Clearcoats
There are several types of clearcoats, each with its own advantages depending on your project and skill level.
1. Urethane Clearcoat
This is the most popular choice for professional and DIY applications. Urethane clearcoats are durable, UV resistant, and provide excellent gloss retention. They usually require mixing with a hardener.
Best For: Daily drivers, restorations, and custom paint jobs that need long-term durability.
2. Acrylic Clearcoat
Acrylic clearcoats are easier to apply and more forgiving for beginners but less durable over time compared to urethane.
Best For: Budget-conscious projects or show cars that will not be exposed to harsh environments regularly.
3. High-Solids Clearcoat
These provide a thicker layer of protection and deeper gloss with fewer coats. They require more skill to apply because of their higher viscosity.
Best For: Show-quality finishes where maximum depth and protection are desired.
How to Apply Clearcoat Correctly
Applying clearcoat properly is essential to avoid defects and get the best possible finish.
Step 1: Prep the Basecoat
Make sure your basecoat is fully flashed (dry to the touch but not fully cured) before applying clearcoat. Any dust or imperfections should be carefully removed before spraying.
Step 2: Mix Properly
Follow the manufacturer’s mixing ratios for clearcoat and hardener. Stir thoroughly and strain into your spray gun to prevent debris.
Step 3: Adjust Your Gun Settings
Set your spray gun to the recommended air pressure and fan pattern for clearcoats. Too much pressure can create overspray while too little can lead to uneven application.
Step 4: Spray Even Coats
Hold the gun perpendicular to the surface, about 6 to 8 inches away. Use smooth, overlapping passes. Typically two to three medium coats are recommended with proper flash time in between.
Step 5: Allow to Cure
Do not rush sanding or polishing. Allow the clearcoat to cure fully based on the product’s specifications.
Common Clearcoat Issues and Fixes
Even experienced painters run into problems from time to time. Here are some of the most common clearcoat issues and how to address them.
Runs and Sags
Runs occur when too much material is applied at once.
Fix: Once cured, wet sand with fine grit (1500–2000) and polish to blend it back. Practice lighter, even coats to avoid this.
Orange Peel
This textured appearance happens when the clearcoat does not flow out properly.
Fix: Wet sand and polish once cured. Adjust gun settings and technique to improve atomization.
Cloudiness or Milky Finish
Often caused by moisture in the air or spraying in humid conditions.
Fix: Make sure your work area is properly ventilated and dry. Warm the panel slightly if needed.
Rely on Miller Coatings and Equipment for Expert Support
We stock a full range of clearcoats, hardeners, and application tools to help you achieve the perfect finish. Our team can recommend the right type of clearcoat for your project and help you troubleshoot any challenges you encounter along the way.
Visit our store or contact us to learn more about the clearcoat products and supplies trusted by professionals and DIYers alike.
