West System 407 Low Density Filler

When achieving a perfectly smooth surface is your goal, WEST SYSTEM 407 Low Density Filler is the ideal solution. Specially formulated with lightweight hollow micro balloons, this premium epoxy additive transforms WEST SYSTEM® epoxy into a creamy, lightweight fairing compound that spreads smoothly, cures with excellent strength, and sands effortlessly.

Designed specifically for fairing and cosmetic repairs, WEST SYSTEM 407 is the preferred filler for marine professionals, boat builders and DIY enthusiasts who require a smooth, paint-ready finish on fiberglass, wood, aluminium and composite surfaces.

Unlike high-density structural fillers, 407 is engineered to minimize weight while maximizing sanding performance, making it perfect for shaping, contouring and eliminating surface imperfections before priming and painting.

Whether you’re restoring a yacht hull, repairing fiberglass damage, fairing a deck, or preparing a composite structure, WEST SYSTEM 407 delivers professional-quality results with less sanding effort and exceptional finishing characteristics.

Key Features

• Premium lightweight micro balloon filler
• Produces an easy-to-sand epoxy fairing compound
• Excellent for filling dents, scratches and surface imperfections
• Creates smooth, paint-ready surfaces
• Lightweight formulation reduces unnecessary weight
• Easy to mix with WEST SYSTEM® epoxy
• Excellent spread ability and shaping properties
• Ideal for marine, woodworking, composite and automotive applications
• Compatible with all WEST SYSTEM® 105 Resin and 200 Series Hardeners

Ideal Applications

• Yacht hull fairing
• Boat restoration and maintenance
• Fiberglass (GRP) repairs
• Composite construction
• Wooden boat repairs
• Filling surface imperfections
• Deck restoration
• Fairing keel and rudder repairs
• Automotive body fairing
• Caravan and motorhome repairs
• Surface preparation before primer and paint

Mixing Instructions

First mix WEST SYSTEM 105 Epoxy Resin with the appropriate hardener. Gradually add 407 Low Density Filler while stirring until the desired consistency is achieved.

Typical consistencies include:

• Ketchup: Thin filling and coating
• Mayonnaise: General fairing and filling
• Peanut Butter: Thick, non-sagging fairing compound for vertical surfaces

The more filler added, the lighter and easier the cured mixture becomes to sand.

Product Specifications

Available Sizes

150g

Ideal for:

• Small repairs
• Localized fairing
• DIY boat maintenance
• Minor fiberglass repairs
• Small woodworking projects

700g

Ideal for:

• Complete hull fairing
• Large restoration projects
• Professional boatyards
• Extensive composite repairs
• Frequent workshop use

Why Choose WEST SYSTEM 407 Low Density Filler?

Preparing a surface before painting is one of the most important steps in achieving a professional finish. WEST SYSTEM 407 allows you to create lightweight, smooth fairing compounds that are easy to apply and exceptionally easy to sand.

Its outstanding workability makes it one of the most trusted fairing fillers in the marine industry, helping professionals and boat owners achieve flawless surfaces on yachts, sailing boats, powerboats, wooden vessels and composite structures.

Whether you’re repairing damage, fairing a new build or restoring an older vessel, WEST SYSTEM 407 provides the smooth finish needed for premium paint and gelcoat applications.

Why Buy from Cavo Yachting?

At Cavo Yachting, we supply genuine WEST SYSTEM® epoxy products, trusted worldwide by marine professionals and boat owners. Whether you need the convenient 150g pack for small repairs or the economical 700g pack for larger restoration projects, you’ll receive authentic products backed by expert marine knowledge and reliable customer service.