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Primer-204, polyurethane rubbers adhesion to metal surfaces.

Primer 204 is an adhesion primer for the promotion of the adhesion between polyurethane casting rubber on various metal surfaces. The primer can be used when the adhesion of p.u. is not sufficient for, for example, mechanical stress or necessary bonding to steel, stainless steel (stainless steel), aluminum, hot-dip galvanized steel and aluminum (anodised).

Primer 204 is solvent based which forms a thin layer. The primer ensures adhesion between the primer and metals such as steel and stainless steel or aluminum. The polyurethane casting rubber ensures good adhesion to the primer.

Make sure that the surfaces are clean and free of grease and if possible the surface can be treated or blasted afterwards. this ensures good adhesion with the primer.

  • A low viscous liquid for the pre-treatment of metal surfaces.
  • Acts as an adhesion promoter between polyurethane products and metal materials, such as steel, stainless steel, hot dip galvanized steel, aluminum and anodized aluminum.
  • Specific weight: approx. 1.0 g / cm³.
  • Viscosity: 30 mPa.s.
  • Drying time at 23 ° C / RH 50%: 30 min to 24 hours.

Packaging: 250 ml
Processing time (min.): Max 24 hours
Surface treatment: 50 ml per 1m2
Application time (hours): 0.5 – 24 hours
Color: yellow
Type of product: primer to promote the adhesion of polyurethane to metals, such as steel, stainless steel, galvanized steel, aluminum and anodised aluminum.


Surfaces must be clean, dry and free from grease, oil, dust, other contaminants or release agents. Adhesion can be improved with pre-treatment such as sanding, cleaning, blasting and activation or combinations of these before applying the primer.

Shake the can very thoroughly. After you hear the mixing ball shake for another minute and then apply a thin but opaque coating of Sika® Primer-204 N with a brush, felt or foam applicator. The ideal application and surface temperature is between 15 ° C and 25 ° C. Apply the primer in one coat. Make sure that this layer is opaque in one go. Consumption and processing method depend on the nature of the substrate and the production process. Close the packaging carefully immediately after use.

45,00 excl. VAT

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