WEST SYSTEM 105-A Epoxy Resin Kit With 205-A Fast Hardener & 300 Mini Pumps brings together the resin, hardener, and metering pumps needed to prepare a marine epoxy mixture. The kit contains a 32 fl oz (946 ml) can of 105-A Epoxy Resin, a 7 fl oz (206 ml) can of 205-A Fast Hardener, and a set of 300 Mini Pumps. It is suited to boat repair, fiberglass work, bonding, and coating projects where you need to measure repeated batches of epoxy. Having the matching components together makes it easier to select the correct resin and hardener for the job.

WEST SYSTEM 105 Epoxy Resin is a clear, pale yellow, low-viscosity liquid. It wets out and bonds with wood fibre, fiberglass, reinforcing fabrics, and a range of metals. Combined with 205 Fast Hardener at five parts resin to one part hardener by volume, it cures into a hard, moisture-resistant solid. This makes the mixture useful for work on fiberglass boats, wood structures, and other projects that call for an epoxy bond or coating. WEST SYSTEM fillers, pigments, and additives can also be mixed into the epoxy when a project calls for different application properties. The choice of filler or additive depends on the work being done.

The included 300 Mini Pumps are calibrated for the 105/205 combination. One full stroke from the resin pump and one full stroke from the matching hardener pump dispense the correct 5:1 ratio, yielding approximately 0.8 fl oz of mixed components before stirring. This helps when preparing smaller, repeatable batches for repair or fabrication work. The pumps meter the components; the dispensed resin and hardener still need to be mixed thoroughly before application. The 300 Mini Pump set includes extension tubes for Group Size A containers, which correspond to the cans in this kit.

205 Fast Hardener is intended for general bonding and coating applications, including work at lower temperatures. At 72°F (22°C), a 100 g mixed batch has a pot life of approximately 9–12 minutes; when spread as a thin film, the stated working time is approximately 60–70 minutes. The mixture reaches a solid state in approximately 6–8 hours and working strength in approximately 1–4 days under the stated conditions. Temperature and the thickness of the mixed epoxy affect these times, so plan the batch size around the work you can complete. The minimum recommended application temperature is 40°F (4°C). Although the 105 resin is clear and pale yellow, the 105/205 combination is not intended for clear coating where the natural appearance of a surface needs to remain visible.

Key Features:

• WEST SYSTEM 105-A Epoxy Resin Kit with 205-A Fast Hardener & 300 Mini Pumps supplies the matched components for measuring and mixing a 5:1 marine epoxy.
• Includes 32 fl oz (946 ml) of 105-A Resin and 7 fl oz (206 ml) of 205-A Fast Hardener.
• Calibrated pumps dispense the correct ratio with one full stroke of each matching pump.
• Low-viscosity resin wets out wood fibre, fiberglass, and reinforcing fabrics.
• The mixed epoxy can be used for bonding or coating and modified with suitable WEST SYSTEM fillers, pigments, or additives.
• 205 Fast Hardener provides a relatively short cure time for projects that call for a fast hardener.

Applications / Suitable For:

• WEST SYSTEM 105-A Epoxy Resin Kit with 205-A Fast Hardener & 300 Mini Pumps is suitable for fiberglass boat repairs that require epoxy bonding or coating.
• Bonding wood components in boatbuilding, strip kayak, or canoe projects.
• Wetting out fiberglass and reinforcing fabrics during construction or repair.
• Preparing measured epoxy batches for marine fabrication and general repair work.
• Projects that require a modified epoxy mixture using a suitable WEST SYSTEM filler or additive.

FAQs:

Q: What is the mixing ratio for this kit?
A: Mix 105 Resin and 205 Fast Hardener at 5:1 by volume. With the matching 300 Mini Pumps, use one full resin-pump stroke for each full hardener-pump stroke.

Q: How long do I have to use the mixed epoxy?
A: At 72°F (22°C), a 100 g batch has a pot life of about 9–12 minutes. Working time is longer when the epoxy is spread as a thin film; temperature and batch size affect the timing.

Q: Can I use this kit for a clear finish on natural wood?
A: The 105/205 combination is not intended for clear coating natural-finish work.