West System 4039 Microfibers, Off-White, 6 oz., 24/case
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
WEST SYSTEM® 403 Microfibers is a fine fiber blend used to thicken epoxy into a multi-purpose adhesive—especially for bonding wood. This off-white filler blends easily, builds volume quickly, and supports gap-filling while still wetting and penetrating wood fibers.
Key Features
- Fine fiber blend thickening additive for epoxy
- Builds volume quickly and blends easily
- Good gap-filling qualities while retaining wetting/penetrating capability into wood
- Cures to an off-white color
- Designed for use as a thickened adhesive for wood bonding and general marine/repair work
Intended Use
- Wood bonding
- Gap filling with epoxy-thickened adhesive
- Thickening WEST SYSTEM® epoxy for multi-purpose bonding/adhesive applications
- Marine and boat repair projects where epoxy is thickened with fillers
Product Details
- Product: WEST SYSTEM 4039 Microfibers, Off-White, 6 oz., 24/case
- Filler use: thickening additive for liquid epoxy resins to create a multi-purpose adhesive
- Color: Off-White; cures to an off-white color
- Package size: 6 oz (per container), 24/case
- SKU on variant: 655-4039
- Model/filler code reference from product family: 403-9 (6 oz)
Parts Desk Insights
Best Use Case: Choose this microfiber filler when you want epoxy thickened into a wood-bonding adhesive that still maintains strong wetting/penetration into wood fibers and helps bridge small gaps.
Common Issues: For best results, mix thoroughly to achieve the intended consistency (too thin won’t fill gaps; too thick may not wet out as well). Confirm your epoxy resin/hardener pairing and mixing proportions with your project instructions and the system’s guidance, since filler-quantity changes the workability and final appearance.
Related Products & Accessories
- Browse WEST SYSTEM epoxy fillers (related sizes) - If you need a different filler type or container size, browse the WEST SYSTEM filler category and match by filler code (e.g., 403 Microfibers family) and desired quantity.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 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.