Discover Sika® Primer-207, a versatile solvent-based primer for enhanced adhesion on various substrates. Learn its benefits, application, and technical details.
Sika® Primer-207 is a high-performance, solvent-based primer designed to enhance adhesion across a diverse range of substrates, making it a critical tool in industries such as automotive, construction, and manufacturing. Its unique formulation, ease of use, and ability to bond with materials like glass, metals, plastics, and painted surfaces make it a go-to solution for professionals seeking durable and reliable bonding results. This comprehensive guide explores the features, applications, technical specifications, and best practices for using Sika® Primer-207, ensuring you achieve optimal performance in your projects.
What is Sika® Primer-207?
Sika® Primer-207 is a pigmented, solvent-based primer that reacts with moisture to form a thin layer, acting as a bridge between substrates and adhesives, particularly Sika’s 1-component polyurethane adhesives. This primer is engineered to improve adhesion on challenging surfaces such as float glass, ceramic-coated glass, pre-coatings, painted surfaces, E-coats, metals, and certain plastics. Its black, low-viscosity formula ensures excellent wetting and penetration, creating a strong foundation for adhesive bonding.
One of its standout features is its fluorescence under long-wave UV light (320–420 nm), which allows for in-process quality control. This luminescent property, while temporary, enables users to verify uniform application, ensuring consistent results. Sika® Primer-207 is particularly valued in automotive glass replacement (AGR) and construction applications, where reliable adhesion is critical for safety and durability.
Key Features and Benefits
Sika® Primer-207 offers a range of advantages that make it a preferred choice for professionals:
- Enhanced Adhesion: Provides excellent bonding on a wide variety of substrates, reducing the need for additional surface activation steps.
- UV Fluorescence: Facilitates quality control by allowing users to verify application under UV light, ensuring complete coverage.
- Ease of Use: Simple application process with brush, felt, or foam applicators, suitable for both small and large-scale projects.
- Versatility: Compatible with diverse materials, including glass, metals, plastics, and painted surfaces, making it ideal for multiple industries.
- Corrosion Resistance: Offers improved protection when applied to bare metal surfaces, enhancing long-term durability.
- Wide Temperature Range: Can be applied in temperatures between 5°C and 40°C, accommodating various environmental conditions.
These features make Sika® Primer-207 a reliable and efficient solution for projects requiring strong, durable bonds.
Applications of Sika® Primer-207
Sika® Primer-207 is used in a variety of applications, particularly in automotive and construction settings. Its primary function is to prepare surfaces for bonding with Sika’s 1-component polyurethane adhesives, ensuring a robust and long-lasting connection. Common applications include:
- Automotive Glass Replacement (AGR): Used to bond windshields and other glass components to vehicle frames, including float glass, ceramic-coated glass, and encapsulated parts.
- Construction Projects: Enhances adhesion on substrates like concrete, wood, metals, and plastics for sealants and coatings.
- Industrial Bonding: Facilitates bonding of components in manufacturing, such as metal panels, plastic moldings, and E-coated surfaces.
- Marine and Aerospace: Provides reliable adhesion in environments requiring resistance to moisture and corrosion.
Substrates Compatible with Sika® Primer-207
The primer’s versatility allows it to bond effectively with:
- Float glass
- Ceramic-coated glass
- Plastics (with testing for stress cracking)
- Pre-coatings and painted surfaces
- E-coats
- Metals (e.g., steel, aluminum)
- Fiberglass-reinforced plastics (FRP)
For materials prone to stress cracking, such as certain plastics, it’s essential to consult the manufacturer and conduct compatibility tests to ensure optimal performance.
Technical Specifications
Sika® Primer-207 is designed with precise specifications to meet the needs of professional applications. Below is a detailed overview of its technical properties:
| Property | Specification |
|---|---|
| Chemical Base | Solvent-based polyurethane solution |
| Color | Black |
| Solid Content | 27% |
| Application Temperature | 5°C to 40°C |
| Application Method | Brush, felt, or foam applicator |
| Consumption | ~50 ml/m² (depending on substrate porosity) |
| Flash-Off Time | 10 minutes (above 5°C); max 24 hours |
| Shelf Life | 9 months (1000 ml); 12 months (smaller packs) |
| Storage Conditions | Sealed container, upright, dry, ≤ 25°C |
Packaging Options and Pricing
Sika® Primer-207 is available in multiple packaging sizes to suit various project scales:
| Packaging | Volume | Approximate Price (USD) |
|---|---|---|
| Stix | 1.4 ml | $5–$10 |
| Can | 30 ml | $15–$25 |
| Can | 100 ml | $25–$40 |
| Can | 250 ml | $50–$70 |
| Can | 1000 ml | $150–$200 |
Note: Prices are approximate and may vary based on region, supplier, and purchase volume. For precise pricing, contact Sika distributors or visit Sika’s official website.
Surface Preparation for Optimal Adhesion
Proper surface preparation is critical to achieving the best results with Sika® Primer-207. The primer’s performance depends on the cleanliness and condition of the substrate. Follow these steps to prepare surfaces:
- Clean the Surface: Ensure the substrate is clean, dry, and free from grease, oil, dust, and contaminants. Use a suitable cleaner, such as Sika® Cleaner G+P, for optimal results.
- Remove Old Coatings: For existing surfaces, remove loose or deteriorated coatings using abrasive pads or sanding.
- Treat Porous Substrates: Fill cracks or defects in porous materials like concrete or wood, and smooth the surface for uniform primer application.
- Test for Compatibility: Conduct adhesion tests on sensitive substrates, such as certain plastics, to prevent stress cracking or bonding issues.
Safety Precautions
When preparing surfaces, prioritize safety to protect yourself and maintain the integrity of the application:
- Wear protective gear, including gloves, goggles, and a respirator, when handling chemicals or using abrasive tools.
- Ensure proper ventilation to minimize exposure to fumes or dust.
- Follow the manufacturer’s guidelines for handling, storage, and disposal of Sika® Primer-207 and related products.
Application Process
Applying Sika® Primer-207 is straightforward but requires attention to detail to ensure optimal adhesion. Follow these steps for a successful application:
- Shake the Primer: Vigorously shake the Sika® Primer-207 can until the mixing balls rattle freely, then continue shaking for an additional minute to ensure a uniform mixture.
- Apply a Thin Coat: Use a brush, felt, or foam applicator to apply a thin, even coat to the prepared surface. Ensure complete coverage without excessive application.
- Allow Flash-Off Time: Let the primer dry for at least 10 minutes (above 5°C). The maximum flash-off time is 24 hours, after which the surface may need re-priming if exposed to contaminants.
- Reseal the Container: Tightly reseal the container with the inner plastic liner immediately after use to maintain product quality.
- Apply Adhesive or Sealant: Once the primer is dry, apply Sika’s 1-component polyurethane adhesive or sealant as per the manufacturer’s instructions.
Application Workflow (Chart)
Below is a visual representation of the application process using a flowchart:
Tips for Optimal Application
- Ideal Conditions: Apply the primer at temperatures between 15°C and 25°C for best results.
- Single Application: Apply Sika® Primer-207 once, ensuring dense coverage without pooling or over-application.
- UV Light Inspection: Use a UV light source (320–420 nm) to verify uniform application, reducing foreign light to enhance detection quality.
- Avoid Dilution: Never dilute or mix Sika® Primer-207 with other substances, as this can compromise its reactivity and performance.
Drying and Curing Time
Factors Affecting Drying Time
The drying (flash-off) time of Sika® Primer-207 depends on several environmental factors:
- Temperature: Higher temperatures (closer to 25°C) accelerate drying, while temperatures below 5°C require additional testing.
- Humidity: Lower humidity levels promote faster drying, while high humidity may extend flash-off time.
- Substrate Porosity: Porous surfaces may absorb more primer, potentially increasing drying time.
- Application Thickness: Thicker coats take longer to dry compared to thin, uniform layers.
Typical flash-off time is 10 minutes above 5°C, with a maximum open time of 24 hours. For specific applications, consult the technical data sheet for precise guidelines.
Verifying Curing
To confirm that Sika® Primer-207 is fully cured:
- Visual Inspection: The primer should appear tack-free and may become clearer upon curing.
- Adhesion Test: Apply a piece of tape to the primed surface and remove it quickly. If the primer remains intact, it is fully cured.
- Time-Based Check: Follow the manufacturer’s recommended curing time (typically 10–30 minutes, depending on conditions).
Proper curing is essential for maximizing adhesion strength and ensuring the longevity of the bond.
Troubleshooting Common Issues
Bubbles or Peeling
Bubbles or peeling may occur due to improper mixing, incomplete surface preparation, or excessive primer application. To resolve:
- Sand the Affected Area: Lightly sand the surface to remove bubbles or peeling primer.
- Reapply Primer: Ensure thorough mixing and proper surface preparation before reapplying a thin coat.
- Check Application Thickness: Avoid over-application to prevent prolonged drying and bubbling.
Incomplete Curing
If the primer does not cure properly:
- Extend Drying Time: Allow additional time for curing, especially in cold or humid conditions.
- Optimize Conditions: Ensure the application environment is within the recommended temperature (5–40°C) and humidity range.
- Reapply if Necessary: If curing remains incomplete, remove the primer and reapply following proper procedures.
Cleaning Spills or Errors
For uncured Sika® Primer-207 spills, use Sika® Remover-208 or Sika® Handwipes for cleanup. Once cured, the primer must be removed mechanically, which may damage the substrate’s surface.
Special Considerations
UV Protection for Transparent Substrates
Sika® Primer-207 is not a substitute for UV protection on transparent or translucent substrates like float glass or plastics. Organic primers, including Sika® Primer-207, degrade under UV radiation, leading to bond failure. Use the following for UV protection:
- Sika® UV Shielding Tape
- Protective metal or opaque plastic trims
- Suitable print color on glass
Handling and Storage
To maintain product quality:
- Reseal Immediately: Close the container with the inner plastic liner after each use to prevent moisture ingress.
- Dispose Promptly: Discard the primer one month after opening (frequent use) or two months (infrequent use). For 30 ml cans, stix, or tubes, use within two weeks or for single applications only.
- Check Viscosity: If gelling or increased viscosity is observed, discard the primer immediately, as it indicates reduced reactivity.
Bonding Freshly Painted Surfaces or FRP
For freshly painted surfaces or fiberglass-reinforced plastics (FRP):
- Allow Paint to Cure: Wait at least 24 hours for paint to fully cure before applying Sika® Primer-207.
- Scuff the Surface: Use an abrasive pad to lightly scuff the surface for better adhesion.
- Clean Thoroughly: Apply Sika® Cleaner G+P to remove contaminants before priming.
Frequently Asked Questions (FAQs)
What is the maximum open time for Sika® Primer-207?
The maximum open time is 24 hours, but environmental factors like high temperatures or dust can reduce this to 2 hours in automotive applications. Clean and reapply if necessary.
Can Sika® Primer-207 be used on bare metal for corrosion protection?
Yes, applying two thick layers of Sika® Primer-207 on bare metal provides enhanced corrosion resistance.
Is it safe to dilute Sika® Primer-207 if it becomes viscous?
No, never dilute the primer, as increased viscosity indicates reduced reactivity, and dilution compromises performance.
How do I clean Sika® Primer-207 from surfaces?
Use Sika® Remover-208 or Sika® Handwipes for uncured primer. Cured primer requires mechanical removal.
Can Sika® Primer-207 replace a ceramic frit for UV protection?
No, it is not a durable UV protectant. Use Sika® UV Shielding Tape, trims, or print color for transparent substrates.
Why Choose Sika® Primer-207?
Sika® Primer-207 stands out as a reliable, versatile, and high-performance primer for professionals in automotive, construction, and industrial applications. Its ability to enhance adhesion across a wide range of substrates, coupled with its ease of use and quality control features like UV fluorescence, makes it an essential tool for achieving durable bonds. By following proper surface preparation, application, and storage guidelines, users can maximize the primer’s effectiveness and ensure long-lasting results.
For more information or specific application advice, contact Sika’s Technical Department or visit www.sika.com. Always refer to the latest Product Data Sheet and Safety Data Sheet for detailed instructions and safety guidelines.
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