West System 105-B Epoxy Resin Bundle with 206-B Slow Hardener

In this review of the West System 105-B Epoxy Resin Bundle with 206-B Slow Hardener, the bottom line is simple: it is aimed at makers and marine repairers who need a reliable, low-viscosity epoxy with predictable working time and accurate metering. The kit combines a large can of clear pale yellow 105-B resin, a can of 206-B slow hardener and calibrated 300 mini pumps that deliver the correct 5:1 mix ratio, which makes it especially useful for boatbuilding, canoe and kayak construction, and structural bonding where consistent mixes and longer pot life matter.

Key Features

• Complete bundle: Includes a 126.6 fl oz can of 105-B resin, a 27.5 fl oz can of 206-B slow hardener and a set of calibrated 300 mini pumps so users have all basic components for many projects.
• Accurate pump metering: The calibrated mini pumps dispense resin and hardener at the 5:1 ratio, so one stroke of each produces the exact 5:1 mix and reduces guesswork when measuring.
• Extended working time: 206-B slow hardener is low viscosity and formulated for longer pot life and better working time at higher shop temperatures, helpful during laminating or large fills.
• Good wetting and bonding: The 105 epoxy resin wets out wood fibers, fiberglass and reinforcing fabrics and bonds to many metals, making it versatile for repairs and construction.
• Low odor and safer handling: The system contains no VOCs and has a relatively high flash point and no solvent odor, making it friendlier in small shops compared with styrenated resins.

Who It's For

The bundle is best for hobbyists, woodworkers and small boatbuilders who need a proven, adaptable epoxy system with accurate metering and a slower hardener for working on larger areas or in warm conditions. The included pumps make it a good choice for users who prefer pump dispensing over weighing or mixing by volume.

Those who need a clear high-gloss finish for appearance reasons should note that the 206-B slow hardener is not intended for clear coating applications; finish-focused users may prefer a different hardener for topcoats. If fast cures for small repairs are required, a faster hardener would be more appropriate.

Pros & Cons

Pros

• Reliable 5:1 pump metering improves measurement accuracy and reduces mixing errors documented by other users.
• Longer pot life at 72F gives 20 to 25 minutes of usable working time and cures to a solid state in 10 to 15 hours for manageable scheduling.
• Versatile adhesion: wets out wood, fiberglass and reinforcing fabrics for structural repairs and builds.
• Low odor and no VOCs make it more pleasant to use in enclosed shop spaces.

Cons

• 206-B slow hardener is not intended for clear coating, so a separate clear-coat hardener is needed for finish work.
• Some users reported occasional leakage from pumps, so check pumps on first use and have spare containment for small drips.

Specifications

Bundle contents	105-B Resin 126.6 fl oz; 206-B Slow Hardener 27.5 fl oz; 300 Mini Pumps
Mix ratio	5 parts resin to 1 part hardener by volume (5:1)
Pot life at 72F (22C)	20 to 25 minutes
Initial cure	Solid state in 10 to 15 hours
Full strength	Cures to maximum strength in 1 to 4 days
Resin color & viscosity	Clear pale yellow, approx 1000 centipoise at 72F
Minimum working temperature	60F (16C)

Our Verdict

The West System 105-B with 206-B slow hardener and calibrated pumps is a strong value for builders and repairers who need dependable bonding, predictable pot life and accurate metering. It simplifies mixing for larger projects and shop use, though those requiring clear final coats should plan a separate topcoat hardener. Overall it is a practical, versatile system for marine work and structural epoxy tasks.

Frequently Asked Questions

Can I use the included pumps to get the correct mix ratio?
The calibrated 300 mini pumps are designed to dispense resin and hardener at the exact 5:1 mix ratio so one pump stroke of each yields the correct mix.

How long do I have to work with a mixed batch?
At 72F (22C) the pot life is about 20 to 25 minutes, with the mix reaching a solid state in 10 to 15 hours and full strength in 1 to 4 days.

Is this suitable for clear coating?
No, the 206-B slow hardener is not intended for clear coating; choose a recommended clear-coat hardener if a transparent finish is required.