Why Smooth Tech Compounds Are Built Different

Setting the Standard in High Performance Filler Compound Technology

When you’ve been in the composites game long enough, whether you’re a professional shop or a serious DIYer, you learn fast that not all filler compounds are created equal. Smooth Tech’s epoxy, polyester, and vinyl ester fillers aren’t just "good enough" to get the job done, they’re engineered to deliver superior results in demanding conditions.

From our FairTech fairing compounds to our MMA products (and everything in between), every Smooth Tech formula is designed with performance, reliability, and ease of use in mind. It’s one thing to say you’re the best, we want to prove it to you. In this blog we pull back the curtain on just what makes Smooth Tech’s product lines unique.

Engineered for Superior Adhesion and Strength

A high performance filler compound is only as good as its bond—but no single formula can truly excel at every application. That’s why Smooth Tech develops four specialized chemistries, each engineered to perform in the environments and conditions where it matters most.

• FairTech VE (Vinyl Ester) – Exceptional chemical and water resistance, ideal for projects that will live in harsh or corrosive environments. Bonds aggressively to composites and metals, making it a go-to for both automotive and marine work where durability under stress is key.
  

• FairTech PE (Polyester) – Fast and cost-effective without sacrificing reliability, this compound is perfect for high-throughput repairs and general-purpose fairing where extreme strength isn’t required but adhesion still matters.
  

• FairTech EX (Epoxy) – Delivers unmatched tensile and compressive strength along with top-tier chemical resistance. Best for structural repairs, high-load areas, and long-term performance where failure is not an option.
  

• FairTech EX-LW (Lightweight Epoxy) – Designed for vertical and overhead work where sag can be a problem, yet still provides exceptional bonding power and stability. A favorite for reducing fatigue during large surface fairing while maintaining professional-grade adhesion.

By tailoring each product to a specific application, Smooth Tech ensures you get the right balance of bond strength, flexibility, and workability for your job, rather than compromising with a “do-it-all” filler that underperforms in critical areas.

Sandability and Finish Quality

When your filler sands easily, it’s more than a time-saver, it’s a money-saver. Poorly formulated fillers can clog sandpaper, require more effort to feather edges, or leave uneven surfaces that need extra work before priming. At Smooth Tech Co, our formulas are engineered for clean, consistent sanding with minimal clogging, letting you move quickly from repair to finish. The result? A smoother surface with fewer imperfections, meaning less rework and a better final appearance.

Built for Real-World Working Conditions

A high performance filler compound needs to handle more than ideal lab conditions—it needs to perform when the weather, temperature, and project demands aren’t on your side. Withstanding the toughest challenges, including:

• Extreme temperature fluctuations

• Prolonged UV exposure

• Continuous vibration and mechanical stress

• Harsh marine and automotive environments

• Direct impact and abrasion

• Long-term water submersion

• Exposure to common solvents and chemicals

From shop floors to open water, we deliver consistent performance when it counts most.

If you want to get the most out of your repair or fabrication work, the difference is clear: Smooth Tech compounds are built to work as hard as you do. Explore our full product line up today and see the difference for yourself.