West System 403 Microfibers Adhesive Filler

When maximum bond strength is essential, WEST SYSTEM 403 Microfibers Adhesive Filler is the professional choice. This premium cellulose microfibre blend transforms WEST SYSTEM epoxy into a versatile, high-strength adhesive suitable for demanding marine, woodworking, and composite applications.

Unlike standard fillers, 403 Microfibers create an epoxy mixture that not only fills gaps effectively but also penetrates deeply into wood fibres, producing exceptionally durable and long-lasting bonds. This makes it one of the best fillers for bonding timber, plywood, hardwood, softwood, GRP (fiberglass), and many composite materials commonly used in yacht construction and repair.

Whether you are repairing a wooden boat, laminating timber components, installing structural joints, or filling irregular gaps, WEST SYSTEM 403 provides the strength and reliability trusted by professional boat builders worldwide. It is compatible with WEST SYSTEM 105 Epoxy Resin combined with any 200 Series Hardener, as well as G/flex 650 and G/5 Five-Minute Adhesive.

Why Choose WEST SYSTEM 403 Microfibers?

• Creates extremely strong structural epoxy adhesives
• Excellent gap-filling properties without sacrificing bond strength
• Maintains outstanding penetration into wood fibers
• Ideal for timber bonding, scarf joints, laminating and structural repairs
• Easy to blend into WEST SYSTEM epoxy systems
• Off-white finish after curing
• Suitable for marine, woodworking and composite applications
• Trusted by professional boat builders and repair specialists worldwide

Typical Applications

WEST SYSTEM 403 Microfibers is recommended for:

• Wooden boat construction
• Yacht and sailboat repairs
• Structural timber bonding
• Bonding plywood panels
• Strip planking
• Laminating wood components
• Filling joints and bonding gaps
• General marine maintenance
• Composite and GRP repairs requiring high-strength adhesive mixtures

Technical Specifications

Available Sizes

• 150g – Perfect for small repairs, DIY projects, and occasional maintenance.
• 750g – Ideal for regular boat repairs, woodworking projects, and professional workshops.
• 800g – Ideal for professional workshops.

Why Buy from Cavo Yachting?

At Cavo-Yachting.gr, we supply genuine WEST SYSTEM epoxy products trusted by marine professionals. Whether you’re repairing a yacht, building a wooden boat, or carrying out structural bonding, WEST SYSTEM 403 Microfibers delivers the strength, reliability, and performance needed for long-lasting results.