Bonda Marine G4 Primer & Sealer - 1kg
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Product Information
Full details
The Bonda Marine G4 Primer & Sealer is a professional-grade, moisture-cured polyurethane solution designed for marine enthusiasts and DIY boat builders who require a reliable bonding agent for fiberglass projects. Its primary benefit lies in its ability to create a tough, non-porous, and flexible seal that ensures long-term structural integrity when bonding materials like wood, metal, and concrete to fiberglass. While it offers superior adhesion, users should be aware that it requires careful timing during the application process, specifically regarding the finger-tacky window, to achieve the best chemical bond.
All features
| Model Part Number | BON12182 |
|---|---|
| Brand | Bonda |
Extended Product Information
FAQs
Can I use Bonda G4 on wet wood?
No. The surface must be clean, dry, and well-prepared for the best adhesion.
What is the finger-tacky state?
It is the condition where the sealer has dried sufficiently that it is no longer wet but remains sticky to the touch, indicating it is ready to bond with the next layer.
Is G4 suitable for metal bonding?
Yes, G4 is specifically designed to prime and bond fiberglass to various substrates, including metal.
Do I need to mix this product with a hardener?
No, Bonda G4 is a single-part, moisture-cured polyurethane and does not require additional hardeners.
How should I clean my brushes after use?
Clean your application tools immediately after use using a suitable solvent like cellulose thinners or as recommended by the manufacturer.
Troubleshooting
The sealer remains liquid and does not cure.
Ensure the application area has adequate airflow and humidity, as the product requires moisture to initiate the curing process.
Poor adhesion to the substrate.
The surface was likely not prepared correctly. Ensure the substrate is clean, dry, and sanded to provide a mechanical key for the sealer.
The coating is uneven or patchy.
Ensure the application is applied as a continuous, uniform film. Thin, even coats are more effective than thick, uneven layers.
Pros and Cons
Pros
- Excellent adhesion to wood, metal, and concrete substrates
- Forms a durable, water-resistant protective film
- Easy single-part application process
- Provides a flexible bond that resists cracking under stress
Cons
- Requires precise timing for the finger-tacky application window
- Only effective on clean, dry, and well-prepared surfaces
- Moisture-cured chemistry may react differently in extremely low-humidity environments
Setup, Compatibility & Care
For optimal results, ensure the environment is well-ventilated and the surface is completely dry. G4 reacts with moisture, so avoid application in damp or rainy conditions. Before starting, sand the substrate to provide a mechanical key, then wipe clean with a solvent to remove dust.
- Compatibility: Safe for use with fiberglass, wood, metal, and concrete.
- Storage: Keep the container tightly sealed in a cool, dry place to prevent premature curing from atmospheric moisture.
- Safety: Always wear appropriate protective gloves and eyewear, as polyurethane resins can be sticky and irritating to the skin.