F421 Polyaspartic Resin — Engineered for Outstanding Performance Across Applications

Are strong paint odors making renovations unbearable? Tired of waiting forever for coatings to dry and holding up your project timeline? Frustrated with outdoor surfaces rusting, cracking, or degrading prematurely? If any of these sound familiar, it’s time to meet a solution that truly delivers — Feiyang Protech’s F421 Polyaspartic Resin.

As a solvent‑free, amine‑functional polyaspartic resin, F421 reacts efficiently with isocyanate curing agents and is engineered to serve both demanding industrial formulations and everyday coating needs. Its high performance, low environmental impact, and user‑friendly characteristics make it a top choice for modern coating systems.

Truly Solvent‑Free and Environmentally Responsible

F421 raises the bar for eco‑friendly coatings. With a solid content exceeding 99%, it meets strict solvent‑free criteria and eliminates the need for additional thinning. Its exceptionally high purity and stability — with a low color rating around 5 Hazen (Pt‑Co) — give it clarity comparable to pure water and virtually no offensive smell or harmful emissions.

This makes coatings formulated with F421 ideal for enclosed indoor environments, controlled workspaces, and even sensitive areas like children’s rooms — no protective masks required and no lingering odor after application. It’s truly an eco‑smart solution that pairs performance with peace of mind.

Rapid Surface Drying That Keeps Projects Moving

Nobody likes downtime. F421 dramatically reduces ‘wait time’ when used with appropriate curing agents such as an HDI trimer — reaching touch‑dry in as little as 15 minutes. That’s roughly the time it takes to grab a coffee or check your phone, and then you’re free to continue work.

That fast curing speed means less idle time on the jobsite, smoother workflows in automotive painting facilities, quicker turnarounds on urgent repair jobs, and even same‑day progress in residential renovations — saving both time and labor costs.

Flexible Performance: From Tough Protection to Durable Finish

One of F421’s standout features is its adaptability. When paired with a flexible curing agent, it can form elastomeric coatings with impressive elongation up to 400% and tensile strengths around 25 MPa, making it ideal for applications where flexibility and crack resistance are essential.

Switch to a rigid curing system or HDI trimer, and F421 delivers a hard, impact‑resistant finish with surface hardness up to 2H, able to resist scratches from keys, nails, and everyday wear.

Plus, coatings based on F421 offer excellent film properties — including smooth leveling, rich gloss, and comprehensive resistance to weathering, water, solvents, acids, alkalis, and salt spray — providing long‑lasting protection in challenging environments.

Outstanding Adhesion Across Substrates

F421 exhibits broad compatibility with a wide range of substrates. It adheres strongly to challenging plastics like ABS, PC, and PVC, as well as metals such as steel and aluminum, forming a durable bond without peeling or flaking.

It also integrates easily with common coating components — including hydroxy acrylics and CAB resins — and reacts well with various isocyanate hardeners. This compatibility reduces the need for complex formulation changes or special additives, giving formulators and applicators more flexibility.

Wide‑Ranging Applications

F421 isn’t just for industrial coatings — its versatility makes it useful in many everyday and specialized applications:

• Premium Coatings: In vehicles, wood finishes, and other high‑end coatings, F421 helps deliver a glossy, durable surface that resists scratches and accelerates cure.
• Corrosion Protection: Ideal for steel structures, pipeline exteriors, and outdoor fencing, it forms a protective barrier that slows corrosion and reduces maintenance needs.
• Waterproofing & Exterior Protection: From roofing to basement moisture barriers and even landscape surface coatings, F421 provides water‑tight performance and resistance to sun, rain, and the elements.
• Renewable Energy: Used in wind turbine blade coatings, putties, topcoats, and leading‑edge protection systems, F421 stands up to outdoor stresses and helps ensure reliable performance in renewable energy applications.

Trusted Quality Backed by Expertise

Developed by Feiyang Protech in Shenzhen, F421’s formulation is unique and globally exclusive, benefiting from decades of R&D and strict quality management systems. Its viscosity range of 800–2500 mPa·s at 25°C ensures ease of handling and consistent results in production.

With environmental regulations tightening and demand rising for high‑performance, durable materials, F421 stands out as a smart choice — whether you’re a coatings manufacturer refining your formulas, a contractor seeking faster performance onsite, or simply looking for a reliable, eco‑friendly coating solution.

Feiyang Protech has been specializing in the production of raw materials for polyaspartic coatings for 30 years and can provide polyaspartic resins, hardeners and coating formulations. Some of our polyaspartic coating formulations: Polyaspartic Coating

Feel free to contact us: marketing@feiyang.com.cn

Our products list:

• Polyaspartic Resin
• Isocyanate Hardener
• Epoxy Hardener

Learn more polyaspartic knowledge: Polyaspartic FAQ