The Ultimate Guide to Choosing the Right Clearcoat: 2K, UHS, or Express?
The Ultimate Guide to Choosing the Right Clearcoat: 2K, UHS, or Express
Whether you’re restoring a classic or working in a high-volume shop, choosing the right clearcoat can make or break your finish. At KMK Refinish USA, we offer several options designed for different needs and application environments but how do you know which one is right for your job?
In this guide, we’ll break down the differences between 2K, UHS, and Express clearcoats, so you can make an informed decision whether you’re new to refinishing or have years of experience behind the spray gun.
What Is a Clearcoat, and Why Does It Matter?
A clearcoat is the final layer of a refinishing system. It's a transparent protective coat applied over the base color to:
- Enhance gloss and depth
- Shield the color from UV rays, chemicals, and scratches
- Ensure long-term durability
Without a high-quality clearcoat, even the most vibrant color fades, dulls, or peels over time.
Option 1: 2K Clearcoat – The All-Purpose Performer
Product example: KMK 2404 HS 2K Clearcoat 4:1
Best for: Full car resprays, panel repairs, durable high-gloss finishes
Mix ratio: 4 parts clearcoat to 1 part hardener (such as KMK 4901 Normal Hardener)
Drying time: Moderate – ideal for controlled environments like spray booths
Why choose it?
2K (two-component) clearcoats are the industry standard. They offer a great balance of:
- Application ease
- Gloss retention
- Scratch and weather resistance
If you’re just getting started, 2K clearcoat is a reliable option that’s forgiving and easy to work with. For pros, it offers versatility for anything from spot repairs to complete repaints.
Option 2: UHS Clearcoat – When Speed Meets High Solids
Product example: KMK 2705 UHS 2:1 Ultra Rapid Clear
Best for: Fast-paced workshops, smart repairs, or quick turnarounds
Mix ratio: 2 parts clearcoat to 1 part hardener (KMK 4425 or KMK 4625)
Drying time: Ultra-fast (15–30 minutes at 60°C / 140°F)
Why choose it?
UHS (Ultra High Solids) formulas contain more solids and fewer solvents, delivering:
- Faster drying
- Thicker film build in fewer coats
- Excellent gloss and protection
Beginners may need a little practice, but once dialed in, this clearcoat saves time and energy. Pros will love the efficiency: get flawless results, faster booth cycles, and happier clients.
Option 3: Express Clearcoat – Your Go-To for Speed Jobs
Product example: KMK 2304 Clearcoat Express 4:1
Best for: Spot repairs, bumper jobs, or parts where speed is key
Mix ratio: 4:1 with a fast hardener
Drying time: Touch-dry in minutes, even without a booth
Why choose it?
Express clearcoats are formulated for rapid application and air-drying. You get:
- Quick turnaround
- Less energy consumption
- Good gloss and leveling for smaller jobs
DIYers or small-shop painters love it because it’s easy to use and dries fast. No fancy booth needed. Professionals use it for "express lanes" or same-day deliveries without compromising quality.
At KMK Refinish USA, our mission is simple: give professionals the tools to achieve top-tier results, every single time.
Whether you’re an experienced refinisher or just starting your journey, our clearcoats and hardeners are designed to be:
✅ Reliable in real shop conditions✅ Easy to apply with consistent flow
✅ Built for long-lasting protection