West System 105 vs TotalBoat High Performance: Which Marine Epoxy Is Better?
Last updated September 01, 2026 · Data from manufacturer TDS and market pricing
Summary
Both West System 105 and TotalBoat High Performance are excellent marine-grade epoxies, but they cater to different workflows. West System 105 uses a 5:1 mix ratio with specialized hardeners (205/206) for temperature-specific curing, making it the professional boatbuilder's choice for precision work. TotalBoat High Performance uses a simpler 2:1 ratio and offers faster cure times, making it more accessible for DIY boat owners and repair work. West System has superior long-term marine testing pedigree, while TotalBoat offers better value and easier handling for smaller projects.
Comparison Table
| Property | Product A | Product B |
|---|---|---|
| Mix Ratio (Volume) | 5:1 | 2:1 |
| Mix Ratio (Weight) | 5:0.86 | 2:0.92 |
| Max Pour Depth | ⅛" per layer | ¼" per layer |
| Cure Time | 24 hours | 12 hours |
| Viscosity | 1,000 cps | 700 cps |
| Tensile Strength | 7,200 psi | 7,800 psi |
| Coverage | 12 sq ft/gal | 16 sq ft/gal |
| Ideal Temperature | 72°F | 70°F |
Verdict
Choose West System 105 when you need proven marine-grade performance for critical boat-building projects, especially when working in varying temperatures (205/206 hardeners allow 35°F–95°F range). Choose TotalBoat High Performance when you want a faster-curing, more forgiving marine epoxy for DIY repairs, smaller projects, or when ease of mixing (simple 2:1 ratio) matters more than the extensive hardener selection. For professional boatyards, West System is the gold standard. For weekend warriors, TotalBoat delivers excellent results at a lower complexity level.
Frequently Asked Questions
Can I use West System 105 below the waterline?
Yes, West System 105 with the appropriate hardener (205 or 206) is suitable for below-waterline applications. It is widely used for hull repair, keel bonding, and anti-fouling coating systems. Proper surface preparation and post-cure sealing are essential for long-term underwater performance.
Does TotalBoat High Performance epoxy yellow in sunlight?
TotalBoat High Performance has UV stabilizers for moderate UV exposure, but it is not specifically formulated as a clear coat. For UV-exposed surfaces, it should be top-coated with a marine-grade UV-resistant paint or varnish. West System 105 with 207 Special Clear Hardener is a better choice for clear, UV-resistant finishes.
Which epoxy is stronger for structural repairs?
TotalBoat High Performance has a slightly higher tensile strength (7,800 psi vs 7,200 psi), but both are more than adequate for structural marine repairs. The key difference is that West System has a longer track record with documented ASTM testing across multiple hardener systems, while TotalBoat offers faster cure and easier handling.
Can I use West System 105 hardeners with TotalBoat resin?
No, hardeners and resins from different manufacturers should never be mixed. Each system is formulated for specific chemical compatibility. Using the wrong hardener can result in incomplete cure, reduced strength, or exothermic failure. Always use the matching hardener from the same manufacturer.
→ View West System 105 Epoxy Resin · → View TotalBoat High Performance Epoxy