WEST SYSTEM Microfibers 20 lb #403-B Buy Direct

WEST SYSTEM 403-B Fiberglass & Repair

403 Microfibers Adhesive Filler is a fine fiber blend specifically engineered to create versatile, high-strength epoxy adhesives with exceptional bonding and gap-filling properties. This professional-grade 20 lb bulk container is ideal for boatyards, professional builders, and serious DIY enthusiasts who need a reliable, multi-purpose adhesive filler for demanding marine applications.

The Ultimate Wood Bonding Filler:

While 403 Microfibers excels in many applications, it’s most renowned for creating superior wood-bonding adhesives. When blended with epoxy, the fine fiber structure creates a thickened mixture that maintains excellent wetting and penetrating properties, allowing it to soak into wood fibers for maximum mechanical bonding while still providing reliable gap-filling performance.

Gap-Filling with Penetration:

Unlike purely thickening fillers that simply bulk up epoxy, 403 Microfibers strikes the perfect balance between gap-filling capability and penetration. The fine fiber blend creates a structural adhesive that can bridge gaps and fill voids while still wetting out and penetrating porous surfaces like wood. This dual capability makes it ideal for real-world bonding situations where surfaces aren’t perfectly matched.

Multi-Purpose Versatility:

403 Microfibers transforms epoxy into a true multi-purpose adhesive suitable for a wide range of bonding applications beyond wood. It creates strong, reliable bonds for structural joints, hardware installations, and general assembly work where you need both strength and gap-filling performance.

Key Benefits:

• Superior Wood Bonding: Penetrates wood fibers while filling gaps for maximum bond strength
• Excellent Gap Filling: Bridges imperfect joints and uneven surfaces reliably
• Strong Structural Bonds: Creates high-strength adhesive joints for critical applications
• Good Wetting Properties: Maintains penetration into porous surfaces despite thickening
• Multi-Purpose Use: Versatile adhesive for wood, composites, and general bonding
• Universal Compatibility: Works with WEST SYSTEM 105/200 Series, G/flex 650, or G/5 Five-Minute Adhesive

Common Applications:

• Bonding wood components in boat construction and repair
• Structural joints requiring gap-filling capability
• Hardware bonding and installation
• General assembly and construction adhesive
• Bonding dissimilar materials
• Filling and bonding imperfect joints

This 20 lb container provides exceptional value for professional operations and frequent users who demand consistent, reliable bonding performance across a wide range of marine construction and repair applications.

Part Number: 403-B
UPC Code: 811343011246