Description
The Chem-Set™ H2O Glue Fast-Set Underwater Structural Adhesive (formerly known as Fast-Set Structural Bonder) is a two-component methacrylate adhesive engineered for wet and submerged environments. It cures rapidly even in fresh water, salt water, humid air, and freezing conditions, making it ideal for pool, spa, and marine repairs where conventional adhesives fail.
This adhesive combines ultra-fast cure times, structural bonding strength, and long-term durability, giving professionals confidence in demanding underwater and outdoor applications.
Key Features & Benefits
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Cures Underwater: Effective in fresh and salt water, submerged areas, and humid environments.
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Ultra-Fast Cure: Rapid set time from -20°C to 25°C (-4°F to 77°F) for quick repairs.
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Structural Strength: Tensile strength up to 5,800 psi with strong lap shear performance.
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Durable: Resistant to weathering, thermal cycling, and long-term aging.
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Minimal Prep: Requires only basic cleaning/abrading for strong bonds.
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Versatile: Bonds fiberglass, PVC, tile, acrylics, metals, stone, and more.
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Heat Resistant: Serviceable up to 120°C (250°F).
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User-Friendly: Paintable, sandable, and dispensed via convenient dual cartridges.
Common Applications
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Repair of pumps, pipes, pool filters, and skimmers
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Reattaching ceramic, glass, and mosaic pool tiles
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Vinyl liner pool step repairs
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Securing anchors and hardware to concrete decks
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Mounting and assembling fixtures, rails, and signage
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Emergency underwater repairs in pools, spas, and marine equipment
Technical Specifications
| Property | Value | Test Method |
|---|---|---|
| Tensile Strength | 5,800 psi | ASTM D638 |
| Tensile Modulus | 246,000 psi | ASTM D638 |
| Elongation | ~10% | ASTM D638 |
| Glass Transition Temp (Tg) | 96–127°C | ASTM E1640 |
| Service Temperature | Up to 120°C (250°F) | – |
| Cure Strength (23°C/73°F) | 145 psi in 9 min; 1,450 psi in 13 min | Internal testing |
| Lap Shear Strength | Maintains >4,000 psi after thermal cycling & heat aging | ASTM D1002 |
| Pot Life (Mixed) | 1–2 minutes | – |
| Appearance (Mixed) | Pale Yellow | – |
Compatible Substrates
| Material | H2O Glue Aquabonder | H2O Glue Epoxy | H2O Glue Fast-Set |
|---|---|---|---|
| Fiberglass | ✅ Excellent | ✅ Excellent | ✅ Excellent |
| Vinyl Liner | ✅ Good | ❌ Not Recommended | ✅ Good |
| Gunite / Concrete | ❌ Not Recommended | ✅ Excellent | ❌ Not Recommended |
| Glass, Porcelain, Ceramic Tile | ✅ Good | ❌ Not Recommended | ✅ Excellent |
| Metal | ✅ Good | ❌ Not Recommended | ✅ Good |
| Acrylic | ✅ Excellent | ❌ Not Recommended | ✅ Excellent |
| PVC | ✅ Excellent | ✅ Excellent | ✅ Excellent |
| Stone | ✅ Good | ✅ Excellent | ✅ Good |
| Painted Surfaces* | ✅ Good | ✅ Good | ✅ Good |
| Epoxy-Coated* | ✅ Good | ✅ Good | ✅ Good |
| Polyethylene / Polypropylene** | ❌ Not Recommended | ❌ Not Recommended | ❌ Not Recommended |
*Bond strength depends on coating integrity.
**Requires surface treatment (not possible underwater).
Compliance & Certifications
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For professional and industrial use only
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Meets performance standards for pool/spa applications
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Safety Data Sheet (SDS) available for handling and storage
Packaging & Ordering Info
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Supplied in dual cartridges with static mixers for precise application
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Standard sizes: 50 ml and 490 ml cartridges
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Shelf life: 18 months at 2–8°C (36–46°F); do not freeze
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Bulk packaging available on request
H2O Product Family
The H2O line from Chemical Concepts provides specialized solutions for pool and spa professionals:
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H2O Glue Underwater Structural Adhesive – for submerged bonding and general pool/spa repair
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H2O Glue Underwater Epoxy – optimized for Gunite pool applications
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H2O Non-Slip Treads – durable, safety enhancing streads for pool stairs
Explore the complete H2O Adhesives & Accessories Collection for a full range of solutions.
Why Chemical Concepts?
With decades of adhesive expertise, Chemical Concepts provides advanced bonding systems for the pool, spa, marine, and construction industries. Our technical support team can help select the right adhesive and ensure proper application.
📞 Call us at 800-220-1966 or request a quote online.
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