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🧩 Build stronger bonds, fill bigger gaps — the pro’s secret weapon!
WEST SYSTEM 404 High-Density Epoxy Filler is a premium, USA-made thickening additive designed to maximize epoxy resin strength and durability. Ideal for structural filleting, hardware bonding, and gap filling, it produces a non-slumping, gap-bridging adhesive compatible with multiple WEST SYSTEM epoxies. Trusted by professionals for its customizable viscosity and water resistance, it ensures long-lasting, high-performance bonds in woodworking, repairs, and heavy-duty applications.
| ASIN | B0006JJAU6 |
| Best Sellers Rank | #78,203 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #111 in Wood Filler |
| Brand | West System |
| Brand Name | West System |
| Color | off-white |
| Compatible Material | Wood |
| Container Type | Aerosol Can |
| Customer Reviews | 4.7 out of 5 stars 107 Reviews |
| Included Components | FILLER HIGH-DENSITY 43 OZ |
| Item Form | Paste |
| Item Package Quantity | 1 |
| Item Type Name | West System Filler |
| Item Weight | 16 ounces |
| Manufacturer | Gougeon Brothers, Inc. |
| Material | epoxy; filler |
| Material Type | epoxy; filler |
| Model | 404-45 |
| Other Special Features of the Product | Strong |
| Part Number | 404-45 |
| Special Feature | Strong |
| Specific Uses For Product | Carpentry, Gap Filling, Hardware Bonding, Repair, Structural Fillets, Woodworking |
| UPC | 811343011413 |
| Unit Count | 43 Ounce |
| Viscosity Level | High |
| Volume | 219 ml |
| Warranty Description | Limited Warranty |
| Water Resistance Level | Water Resistant |
B**I
Epoxy filler
Nice addition to west epoxy, thickens mixture and fills gaps, just as advertised.
R**U
great products
west system is great products
K**A
Great filler
I use West System products exclusively when doing marine fiberglass repairs/modifications. There are many different filler options, so choose the one that best fits your needs. Mix the resin, add the filler and mix to your desired consistency, then apply. For me, usually similar to mayonnaise works best. Drying time will depend on your choice of hardener and if you've adjusted the resin/hardener ratio.
I**G
Solid
Must have for epoxy work, mixes well without clumps
C**E
Works as deisigned
Mixes well. Solid when set using West System products.
M**.
Great filler
Easy to thicken your resin with, great product. Makes really strong glue when mixed with epoxy resin.
J**R
Works good
We purchased this to fix our RV fill in a soft spot. First off it is easy to mix in with the kit but it does set up fast! So you need to be ready to go to pour when you mix it. It worked great for what we used it for, has been fixed for well over a year now and still holding strong.
A**R
Five Stars
Excellent product. Does what it's supposed to do, and a lot cheaper through Amazon.
G**S
Excellent Product
Works has West System had said
Trustpilot
1 week ago
1 week ago