WEST SYSTEM® 410 Microlight® Fairing Filler is the lightest and easiest-to-sand fairing filler in the WEST SYSTEM lineup. Specially formulated to blend with WEST SYSTEM epoxy resin and hardener, it produces a smooth, creamy fairing compound that spreads effortlessly, feathers beautifully, and sands with minimal effort after curing.
Designed for cosmetic fairing and surface refinement, Microlight® is the preferred choice for preparing fiberglass, wood, and composite surfaces before primer, paint, or gelcoat. Its extremely low-density formula allows users to build and shape contours without adding unnecessary weight, making it ideal for marine, automotive, aerospace, and composite construction projects where lightweight finishing is essential.
Unlike structural fillers, 410 is engineered specifically for fairing and surface finishing. It fills low spots, smooths fiberglass repairs, eliminates surface imperfections, and creates seamless transitions that require very little sanding. The tan-colored filler also blends well with many substrates and accepts primers and paints with excellent results.
Whether you’re restoring a boat hull, shaping composite parts, repairing fiberglass panels, or preparing a custom project for a flawless finish, WEST SYSTEM 410 Microlight® provides the professional results trusted by builders and repair technicians worldwide.
Features & Benefits
- Ultra-lightweight fairing filler for WEST SYSTEM epoxy
- Fast, effortless sanding saves time and labor
- Produces an exceptionally smooth, creamy fairing compound
- Feathers easily into surrounding surfaces
- Excellent for filling low spots and cosmetic imperfections
- Ideal for fiberglass, wood, and composite materials
- Reduces added weight compared to traditional fillers
- Provides an excellent surface for primer, paint, and gelcoat
- Compatible with all WEST SYSTEM epoxy resin and hardener systems
Typical Applications
- Fairing boat hulls, decks, and transoms
- Cosmetic fiberglass repairs
- Composite panel finishing
- Wood boat restoration
- Surface preparation before painting or gelcoating
- Filling dents, waves, and surface irregularities
- Lightweight shaping and contouring
- Automotive and aircraft composite finishing
Note: WEST SYSTEM 410 Microlight® is intended for fairing and cosmetic finishing applications only. It is not recommended for structural bonding, high-load fillets, or applications requiring maximum compressive strength. For structural adhesive applications, use fillers such as WEST SYSTEM 406 Colloidal Silica or 404 High-Density Filler instead.
