West System 404 High Density Putty

WEST SYSTEM 404 High-Density Filler | Structural Marine Bonding & Repair

Achieve unparalleled strength and durability for your boat´s most critical components with WEST SYSTEM 404 High-Density Filler. Specially formulated for the most demanding marine environments, this high-performance additive transforms WEST SYSTEM resin and hardener into an exceptionally strong, stiff, and resilient structural adhesive putty. It is the professional´s choice for repairs and installations where failure is not an option.

When you need to mount hardware that will be under constant stress—like winches, cleats, stanchion bases, or engine beds—a standard epoxy isn´t enough. You need a structural adhesive that can withstand vibration, tension, and shock. This is precisely where WEST SYSTEM 404 excels. By mixing it into your epoxy, you create a superior bonding putty that provides maximum load-bearing capacity and impact resistance, ensuring your fittings stay secure, season after season.

Key Benefits & Features:

* Ultimate Structural Strength: Creates an incredibly strong, rigid structural adhesive ideal for bonding hardware, fasteners, and load-bearing components. It provides excellent support and stiffness, preventing flexing and potential failure in high-stress areas.
* Superior Load Resistance: A filler developed to maximize the bond strength of fittings when high cyclic loads are anticipated. It is the perfect solution for applications subject to repeated stress, vibration, and shock, ensuring long-term reliability and safety.
* Incredible Versatility: Beyond hardware bonding, it can also be a used for filleting and gap filling applications. Create strong, robust structural fillets at bulkheads or other joints, and confidently fill voids and gaps where ultimate strength is required.
* Exceptional Control & Handling: When mixed, it creates a smooth, non-sagging, putty-like consistency that is easy to tool and apply. It stays put, even on vertical or overhead surfaces, allowing for clean, precise application without slumping or running.
* Durable, Professional Finish: The cured epoxy/404 mixture results in a hard, dense surface that can be easily sanded and finished for a professional look. Its durability ensures that your repairs and installations will withstand the harsh marine environment.

Mixing Directions:

For optimal performance, customize the viscosity to your specific needs. Can be added to resin/hardener at 35% to 60% by weight, depending on viscosity required. A lower percentage creates a trowelable consistency suitable for initial wetting, while a higher percentage yields a very thick, non-slump putty perfect for filling large gaps and creating structural fillets.

For any boat owner or marine professional undertaking structural repairs or installations, WEST SYSTEM 404 High-Density Filler is an essential addition to your maintenance toolkit. Trust in its proven strength to provide secure, lasting, and dependable results for the most critical jobs on your vessel