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Item #:
23836966
WEST SYSTEM 403 Microfibers Filler | High-Strength Structural Epoxy Wood Filler Additive for WEST SYSTEM Epoxy | Marine and Exterior Epoxy Joint
Item #:
23836966
AED 217
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Imported from USA store
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Order now and get it around Friday, August 21
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WEST SYSTEM Fillers modify the consistency of epoxy, greatly increasing its versatility for a wide array of applications
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What Stands Out
Exceptional Strength
WEST SYSTEM 403-28 Microfibers enhance the strength and durability of epoxy systems, providing superior bonding and resistance to impact, making it ideal for demanding applications.
Versatile Applications
These microfibers are suitable for various projects, ranging from boat construction to general repairs, making them a versatile choice for professionals and DIY enthusiasts alike.
Easy Mixing
The lightweight nature of WEST SYSTEM 403-28 Microfibers allows for easy mixing with epoxy, ensuring a smooth application while reducing the overall weight of the cured product.
Product Details
- Thickens epoxy resin and hardener for multi-purpose adhesive
- Ideal for bonding wood with good gap-filling qualities and excellent wetting-out/penetrating into wood fibers
- Creates non-slumping adhesive with high-density filler for bonding wood joints
- Amount of filler added controls epoxy's viscosity with no strict formula
- Chart offers guidelines for different consistencies of thickened epoxy: catsup, mayonnaise, and peanut butter
- Ability to create own epoxy/filler recipe for consistent viscosity across multiple batches
| Brand Name | West System |
| Flavor | Unflavored |
| Age Range Description | Adult |
| Item Form | Paste |
| Manufacturer | WEST SYSTEM |
| UPC | 783847065240 811343011215 |
| Model Number | 403-28 |
| Manufacturer Part Number | 403-28 |
| Item Weight | 16 Ounces (453.6 grams) |
| Included Components | urea-resin-adhesives |
| Item Nype Name | FILLER MICROFIBERS 20 OZ |
| Liquid Volume | 20 Fluid Ounces |
| Number of Items | 1 |
| Unit Count | 20.0 Ounce |
| Brand | West System |
| Age Range (Description) | Adult |
Who Should Buy?
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Boat Builders
Ideal for enhancing epoxy applications in boat construction and repair, providing improved strength and durability.
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DIY Enthusiasts
Perfect for home improvement projects requiring reinforced adhesive, ensuring a stronger bond for various materials.
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Composite Repairs
Useful for those working with fiberglass or carbon fiber, offering additional structural integrity in repairs and modifications.
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Casual Users
Not suitable for individuals needing a simple adhesive solution that requires no additional reinforcing.
Product Description
WEST SYSTEM 403 Microfibers Filler | High-Strength Structural Epoxy Wood Filler Additive for WEST SYSTEM Epoxy | Marine and Exterior Epoxy Joint Filler | Made in the USA
Have any Query? Chat with us
Customer Questions & Answers
-
Question:
What are WEST SYSTEM 403-28 Microfibers used for?
Answer: WEST SYSTEM 403-28 Microfibers are primarily utilized as a filler for epoxy resin applications. They enhance the physical properties of the epoxy, making it thicker and more suited for vertical surfaces, while also improving bonding strength. This is especially useful in boat repairs and construction where robust adhesion is crucial. Additionally, these microfibers can be used in applications requiring gap-filling or inlay work, offering an excellent solution for achieving smooth finishes in various projects. -
Question:
How do I mix WEST SYSTEM 403-28 Microfibers with epoxy resin?
Answer: To use WEST SYSTEM 403-28 Microfibers, start by preparing your epoxy resin according to the manufacturer's instructions. Gradually add the microfibers to the mixed epoxy until the desired consistency is achieved. A thicker paste is recommended for vertical or overhead applications to prevent sagging. This allows for effective filling and bonding in construction or repair projects, ensuring long-lasting results in your work. -
Question:
Are WEST SYSTEM 403-28 Microfibers safe to use?
Answer: While WEST SYSTEM 403-28 Microfibers are generally safe when used correctly, it’s important to follow safety protocols. Wearing gloves, a mask, and protective eyewear is advisable to prevent any irritation or allergic reactions. Proper ventilation during application also minimizes inhalation hazards. These precautions ensure a safe working environment, making it suitable for both hobbyists and professionals in various crafting and boating projects. -
Question:
Can I use WEST SYSTEM 403-28 Microfibers for sanding?
Answer: No, WEST SYSTEM 403-28 Microfibers are not intended for sanding purposes. Instead, they serve as a filler for thickening epoxy resin to achieve a desired texture and bonding capability for vertical applications. If you’re looking to create a smoother finish post-application, once the epoxy has fully cured, traditional sanding techniques can be applied to achieve the desired surface finish. -
Question:
What is the shelf life of WEST SYSTEM 403-28 Microfibers?
Answer: When stored properly, WEST SYSTEM 403-28 Microfibers can have a long shelf life. It's crucial to keep them in a cool, dry place and ensure that the container is tightly sealed to prevent moisture from affecting the granules. This is important because exposure to damp conditions can alter the performance and effectiveness in your epoxy applications, making it vital for users in crafting and building to observe these storage recommendations. -
Question:
Are there specific projects that benefit from using WEST SYSTEM 403-28 Microfibers?
Answer: Yes, several projects benefit from using WEST SYSTEM 403-28 Microfibers, particularly in marine applications. They are ideal for boat repairs, where a thickened epoxy is required to bridge gaps, fill voids, or bond to vertical surfaces without drooping. This makes them perfect for scenarios such as repairing transoms, hulls, or deck fittings, ensuring structural integrity and durability in tough marine environments. -
Question:
Can WEST SYSTEM 403-28 Microfibers be used with other brands of epoxy?
Answer: While WEST SYSTEM 403-28 Microfibers are formulated for optimal performance with WEST SYSTEM epoxies, they may be compatible with other epoxy brands. It’s essential to test compatibility for the best results. If you’re working on projects using different epoxy systems, understanding the specific chemical interactions is crucial to maintain adhesive strength and effectiveness in your applications. -
Question:
What is the optimal temperature for applying WEST SYSTEM 403-28 Microfibers?
Answer: The optimal temperature for applying WEST SYSTEM 403-28 Microfibers in epoxy is between 60°F and 90°F. Within this range, the epoxy cures effectively, ensuring strong bonds and proper thickness. Colder temperatures can slow curing times and affect viscosity, while hotter conditions may cause premature curing. Therefore, understanding these temperature dynamics is important for achieving the desired consistency and performance in your projects. -
Question:
How do I clean up after using WEST SYSTEM 403-28 Microfibers?
Answer: After using WEST SYSTEM 403-28 Microfibers, clean up any spills or excesses using a solvent such as acetone before the epoxy has cured. For tools or containers, do so immediately; however, once the epoxy hardens, removal becomes significantly more difficult. Using disposable tools is often a convenient method for application and cleanup, minimizing mess and ensuring effective use of the materials. -
Question:
Where can I buy WEST SYSTEM 403-28 Microfibers in UAE?
Answer: You can purchase WEST SYSTEM 403-28 Microfibers from Ubuy, which is one of the reliable platforms for securing marine supplies and epoxy products. They offer a comprehensive selection of products, including specialized materials needed for your repair or crafting projects. With Ubuy, you can easily find and order WEST SYSTEM microfibers, ensuring you have the right tools for your next endeavor.
West System Wood Filler 403-28 Editorial Review
The WEST SYSTEM 403-28 Microfibers is a versatile product that can be used as a thickener or extender for epoxy mixes. It provides body to the mixture, making it ideal for use as a filler. However, it should be noted that the 403 Microfibers is white in color and may slightly alter the color of gel coat when used to thicken it. For gel coat applications on vertical surfaces to prevent sagging, the 406 Colloidal Silica may be a better choice. The fibers in the 403 Microfibers are made from a blend of cellulose pulp and silica. It can be mixed with sawdust to achieve a color match with woodwork, and it is also easy to sand.
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Pros
- Versatile product that can be used as a thickener or extender for epoxy mixes
- Provides body to the mixture, making it ideal for use as a filler
- Can be mixed with sawdust to achieve a color match with woodwork
- Easy to sand
Cons
- White color may slightly alter the color of gel coat
Platform Trust & Buyer Confidence
HB
Haitham
Verified buyer
“Excellent experience”
11 June 2026 · via Trustpilot
RF
Rasanga
Verified buyer
“I had an excellent experience with Ubuy UAE. I ordered a product from the USA, and the website clearly mentioned that deliveries might be delayed due to the current situation in the Middle East. Ubuy provided great value, transparent communication, and reliable delivery. Thank you, Ubuy UAE, for a fantastic shopping experience!”
17 June 2026 · via Trustpilot
SC
Simon
Verified buyer
“On time delivery and great product at a really great price!”
8 April 2026 · via Trustpilot
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Vladislav
Verified buyer
“Fast delivery. Quality as expected.”
03-Jul-26 · via Trustpilot
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Hope
Verified buyer
“Excellent experience! The service was top-notch, reliable, and very fast. I am completely satisfied with their professionalism and highly recommend Ubuy UAE to everyone.”
02-Jul-26 · via Trustpilot
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AED 217
Order now and get it around Friday, August 21
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Features & Benefits
- WEST SYSTEM offers high-quality epoxy resins, hardeners, fillers, and additives
- Proprietary, structural, and marine grade formulations
- Products have set the standard for epoxy quality since 1969
- Selection guide for choosing the right products
- Fillers greatly increase epoxy's versatility
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