Sikaflex®-215 | Paint Shop Compatible Brushable Polyurethane Sealant

15/07/2026

Sikaflex®-215 | Paint Shop Compatible Brushable Polyurethane Sealant

Sikaflex®-215 | Paint Shop Compatible Brushable Polyurethane Sealant

Sealing applications in industrial production lines require critical performance characteristics such as high temperature resistance, paint oven compatibility, and strong surface adhesion. Sikaflex®-215 is a specially developed, low-viscosity, brushable, and paintable one-component polyurethane-based sealant designed to meet these demanding requirements.

It is particularly optimized for pre-paint sealing applications on cataphoretic coated (KTL) surfaces in commercial vehicle manufacturing.

Product Description

Sikaflex®-215 is a high-performance polyurethane sealant that cures with atmospheric moisture.

It is specially formulated to provide strong adhesion on cataphoretic-coated metal surfaces. Thanks to its brushable consistency, it allows smooth application and controlled formation of sealing joints.

With resistance to paint oven temperatures up to 120 °C, solvent-free formulation, and low odor characteristics, it provides advantages in both production safety and environmental performance.

Application Areas

Sikaflex®-215 is widely used in industrial sealing applications, including:

  • Commercial vehicle manufacturing (bus, truck, trailer, and minibus body production)
  • Sealing of cataphoretic-coated (KTL) chassis and body components
  • Pre-paint sealing applications
  • Joint sealing on metal panels and welding areas
  • Brushable sealing applications requiring surface smoothing
  • Industrial surfaces exposed to elevated temperatures

The product withstands paint oven temperatures of up to 120 °C for 2 hours. For exterior joint applications, overpainting is recommended.

Technical Properties (Summary)

  • Chemical basis: One-component polyurethane
  • Curing mechanism: Moisture curing
  • Colors: White, Grey
  • Density (uncured): ~1.40 kg/L
  • Skin formation time (23 °C, 50% RH): ~20 minutes
  • Curing rate: ~3 mm / 24 hours
  • Volume shrinkage: 1.5%
  • Shore A hardness: 55
  • Tensile strength: 1.4 MPa
  • Elongation at break: 170%
  • Tear resistance: 6 N/mm
  • Service temperature: –50 °C to +90 °C
  • Paint oven resistance: 120 °C / 2 hours
  • Application temperature: +5 °C to +40 °C
  • Optimum application temperature: +15 °C to +25 °C
  • Packaging: 300 ml cartridge (white), 23 L pail, 195 L drum
  • Shelf life: 12 months for cartridges, 9 months for drums (below 25 °C)

Advantages

Sikaflex®-215 offers several benefits for industrial production environments:

  • Easy application and smoothing with a brush
  • Can be painted in both wet and cured conditions
  • Resistant to 120 °C paint oven temperatures
  • Solvent-free and low odor formulation
  • Suitable for long-distance application with pump systems
  • Provides flexible and durable sealing performance
  • Excellent compatibility with cataphoretic-coated metal surfaces

Application Method

Surface Preparation

The surface must be clean, dry, and free from oil, grease, and contaminants. For optimum performance, appropriate surface preparation procedures should be followed and primer should be used when required.

Application

  • Apply between +5 °C and +40 °C.
  • Can be applied manually, pneumatically, or with pump systems.
  • The material can be spread to the required thickness using a brush.

Tooling and Smoothing

The product should be smoothed with a brush within the skin formation time (approximately 20 minutes).

Paintability

  • Can be painted in both wet and fully cured conditions.
  • Maximum recommended application thickness is 3 mm.
  • Paint oven temperature should not exceed 120 °C.
  • Due to differences in elasticity between paint systems and sealants, compatibility testing is recommended before application.

Cleaning

  • Uncured product can be removed with a suitable cleaner.
  • Once cured, it can only be removed mechanically.

Limitations

  • Exterior joints must be painted over.
  • Preliminary testing is required on plastic surfaces with a risk of stress cracking.
  • Suitable only for professional users.
  • Do not apply below +5 °C.
  • Do not expose to high temperatures or solvents before complete curing.

Conclusion

Sikaflex®-215 is a brushable, high-temperature-resistant polyurethane sealant developed for pre-paint sealing applications in commercial vehicle manufacturing and industrial production lines.

Its excellent compatibility with cataphoretic-coated surfaces, 120 °C paint oven resistance, and easy processing properties improve production efficiency while providing long-lasting, flexible sealing performance. It is a reliable solution for professional industrial applications.

Frequently Asked Questions (FAQ)

What is Sikaflex®-215?

It is a moisture-curing, low-viscosity, brushable, and paintable polyurethane sealing compound.

Which industries use Sikaflex®-215?

It is mainly used in commercial vehicle manufacturing and industrial pre-paint sealing applications.

What is its temperature resistance?

It withstands paint oven conditions of 120 °C for 2 hours.

Can Sikaflex®-215 be painted?

Yes. It can be painted both before and after curing.

What packaging options are available?

It is available in 300 ml cartridges, 23 L pails, and 195 L drums.

How is it applied?

It can be applied by brush, gun, or pump system. Its low viscosity allows easy spreading and processing.