West System 407 Low Density Filler – 14 lb
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
Lightweight Epoxy Fairing Compound for Hull & Deck Work
The 407 Low Density Filler is a microballoon-based blending additive designed to be mixed with epoxy resin and hardener to create lightweight, easily workable fairing putties. Its low density makes it ideal for applications where weight savings matter and where the cured surface will be shaped, carved, or sanded to a smooth finish. Cures to a distinctive dark red/brown colour, making it easy to identify coverage during fairing work.
Key Features
- Microballoon-based formula creates a lightweight, low-density fairing compound
- Easy to sand and carve once cured — ideal for achieving smooth, fair hull surfaces
- Good strength-to-weight ratio for a filled epoxy system
- Cures to a dark red/brown colour for easy visual reference during fairing
- Mix with epoxy resin and hardener to achieve desired consistency
- 14 lb bulk size for larger fairing and repair projects
Common Applications
- Fairing boat hulls, decks, and keels prior to painting
- Filling low spots, voids, and surface imperfections in fiberglass and wood substrates
- Building up lightweight fairing layers on composite structures
- Shaping and profiling repairs where the cured material will be sanded flush
Recommended Pairings
Mix with West System C105A Epoxy Resin and a compatible hardener. For large fairing areas in warm conditions, pair with the West System C209SB Extra Slow Hardener for extended working time. For structural bonding or filleting (not fairing), see West System 406 Colloidal Silica Filler instead.
Parts Desk Insights
Best Use Case: The 407 is the go-to filler for hull fairing work — particularly on sailboat keels, powerboat hulls, and any large surface area that needs to be built up and sanded fair before a topcoat. Its low density means less weight added to the structure, and it sands cleanly without loading up sandpaper the way denser fillers can. For customers doing structural repairs or bonding rather than fairing, steer them toward West System 406 Colloidal Silica Filler or a flexible adhesive system like the West System G/Flex 655 Epoxy — 407 is optimized for fairing, not structural bonding. The 14 lb size is best suited for professional yards, boatbuilders, or owners undertaking full hull refairing projects.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.