Description
Sika® Primer-209 D is a solvent-based polyurethane primer designed to improve adhesion on paints and plastics before the application of Sika one-component polyurethane adhesives and sealants. This moisture-reactive, pigmented primer forms a thin interfacial layer that supports more reliable bonding on a broad range of coated and plastic substrates in industrial assembly and glazing applications.
Key Features
- Solvent-based polyurethane primer for paints and plastics
- Designed to improve adhesion before use of Sika 1-component polyurethanes
- Forms a moisture-reactive bonding layer between substrate and adhesive
- Can provide adhesion on certain plastic substrates without a separate activation step
- Easy to apply by brush, felt, or foam applicator
- Suitable for professional surface preparation workflows
Technical Specifications
| Specification | Value |
|---|---|
| Chemical Base | Solvent-based polyurethane solution |
| Color | Black |
| Solid Content | 30% |
| Application Temperature | 5 to 40 °C |
| Application Method | Brush, felt, foam applicator |
| Consumption | 50 ml/m² |
| Flash-Off Time (≥ 15 °C) | 10 minutes |
| Flash-Off Time (< 15 °C) | 30 minutes |
| Maximum Flash-Off Time | 24 hours |
| Shelf Life | 9 months |
Compatible Substrates and Materials
- GRP
- Epoxy resins
- PVC
- ABS
- PMMA
- PC
- PS
- Acrylics
- Alkyds/melamine coatings
- Powder coatings
- Baking varnishes
Application Guidance
Surfaces must be clean, dry, and free from grease, oil, dust, and contaminants before application. Additional pre-treatment such as scuffing, cleaning, or activating may be used where needed. Shake thoroughly until the mixing ball moves freely, continue shaking for another minute, then apply one thin but covering coat with a brush, felt, or foam applicator. Ideal application and surface temperature are between 15 °C and 25 °C, and the container should be tightly resealed immediately after use.
Typical Use Cases
- Adhesion promotion on painted substrates before polyurethane bonding
- Surface preparation for plastic bonding applications
- Pre-treatment for coated components in industrial assembly
- Bond face preparation in glazing and transportation applications
- Improving adhesion on mixed plastic and coated part assemblies
Target Industries and Buyers
- Industrial manufacturers
- Transportation and vehicle assembly operations
- Glazing and panel bonding professionals
- OEM production teams
- Marine and composite fabricators
Performance Advantages
Within the adhesion promoter category, Sika® Primer-209 D is formulated specifically for paints and plastics where bond reliability can be difficult to achieve without proper surface preparation. Its moisture-reactive primer layer helps improve compatibility between coated or plastic substrates and polyurethane adhesive systems, supporting more consistent bonding performance in production environments.
Common Questions
Q: What is Sika® Primer-209 D used for?
A: It is used to improve adhesion on paints and plastics before applying Sika one-component polyurethane adhesives and sealants.
Q: What types of substrates is it designed for?
A: It is designed for many plastics and painted surfaces, including GRP, PVC, ABS, PMMA, PC, PS, acrylics, and several coating types.
Q: How is it applied?
A: It is applied as a thin but covering coat using a brush, felt, or foam applicator.
Q: Is more than one coat required?
A: No, it is intended to be applied once only.
Q: Does it need flash-off time?
A: Yes, allow about 10 minutes at temperatures of 15 °C or higher, or 30 minutes below 15 °C.
Q: Is it an adhesive by itself?
A: No, it is a primer used to support adhesion before adhesive application.
Q: Why is substrate testing important?
A: Preliminary testing is mandatory because plastics and coatings vary widely and adhesion must be confirmed under production conditions.
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