WEST SYSTEM 105B Epoxy Resin Bundle with 205B Fast Hardener - Fast

Our review of this WEST SYSTEM epoxy bundle finds it ideally suited for builders and repairers who need a dependable, fast-curing structural epoxy. The kit pairs 105-B resin with 205-B fast hardener and calibrated 300 mini pumps so users get the correct 5:1 mix ratio without guesswork; that single convenience is the biggest reason to buy. This review focuses on ease of use, cure speed, and versatility for wetting out wood, fiberglass and fabrics in common workshop and marine repair scenarios.

Key Features

• Premeasured mini pumps: Calibrated pumps dispense the correct 5 to 1 mix ratio so each stroke yields an accurate 0.8 fl oz epoxy mix, reducing measuring errors and waste.
• Fast hardener: 205-B fast hardener gives a rapid room temperature cure that develops strength quickly and shortens fixture time for many bonding tasks.
• Low viscosity resin: 105-B resin is a clear, pale yellow, low-viscosity liquid that wets out wood fibers and reinforcing fabrics effectively for strong bonds.
• Wide compatibility: The resin bonds with wood, fiberglass, reinforcing fabrics and many metals, making it useful for construction and repair projects.
• Work and cure window: Pot life at 72F (22C) is about 9 to 12 minutes with a solid state in 6 to 8 hours and full strength in 1 to 4 days, allowing paced work without long waits.
• Low odor and safer handling: The system contains no solvents and has a relatively high flash point, giving a friendlier working environment than styrenated resins.

Who It's For

This epoxy bundle is aimed at serious DIYers, boatbuilders, canoe and kayak builders, and professional repair shops that need a reliable structural epoxy that cures quickly at room temperature. The included large resin can and fast hardener cover projects from strip kayak lamination to patching fiberglass boat decks and horizontal surface coatings where rapid development of physical properties is important.

Those needing a long pot life for large pours or a formulation intended specifically for clear glossy topcoats should look elsewhere, since 205-B fast hardener cures rapidly and is not recommended for clear coating applications.

Pros & Cons

Pros

• Accurate, durable pumps simplify mixing and reduce waste for repeatable 5:1 mixes.
• Rapid cure develops usable strength fast, speeding repair and assembly workflows.
• Low-viscosity resin wets out fabrics and wood well for good adhesion and laminations.
• Low odor and no solvents improve shop comfort during use.

Cons

• Short pot life at room temperature limits large batch work and requires quick application.
• 205-B is not formulated for clear coating, so additional products are needed for finished glossy surfaces.

Specifications

Our Verdict

This WEST SYSTEM bundle delivers practical value for users who need a dependable, fast-curing structural epoxy with accurate dispensing built in. It is especially good for boat repair, wood laminations and horizontal applications where quick strength gain and precise mixing matter. Buyers who need long working times or a product intended for high-gloss clear topcoats should consider alternate hardener options, but for straightforward bonding and laminating this kit is a sensible, time-saving choice.

Frequently Asked Questions

Can the mini pumps be trusted for accurate mixing?
The calibrated pumps dispense resin and hardener at the correct 5:1 ratio and yield about 0.8 fl oz of mixed epoxy per matched stroke, so they are suitable for repeatable mixes.

Is the 205-B hardener suitable for clear coating?
No, 205-B fast hardener is not intended for clear coating applications; use a recommended slower hardener if a glossy clear coat is required.

How quickly will the epoxy cure at room temperature?
At about 72F (22C) pot life is 9 to 12 minutes, it cures to a solid in 6 to 8 hours and reaches maximum strength in 1 to 4 days.