RENIA – Primer for PUR – Polyurethane Foam Strengthener & Primer
Renia Primer for PUR is a specialized German-engineered chemical primer formulated by Renia GmbH. It is designed specifically to reinforce and seal the delicate cellular structure of soft, flexible, and open-cell Polyurethane (PUR) foams prior to adhesive application.
When bonding soft PUR foam using polychloroprene (CR) contact cements (such as Renia Colle de Cologne, Multi-Colle, or Top-Fit), the porous foam can over-absorb the adhesive or tear under stress. Renia Primer für PUR deeply consolidates the foam surface, creating a reinforced barrier that prevents glue oversaturation and guarantees maximum tear-proof bond strength.
Key Highlights & Advantages:
- Substrate Reinforcement: Deeply strengthens weak, degraded, or soft foam cell walls to prevent surface tear-out under load.
- Prevents Glue Sink-In: Seals porous foam open cells, preventing excessive contact cement absorption and ensuring the adhesive stays on the surface where bonding occurs.
- Essential for CR Cements: Enables secure, permanent bonding of PUR foams using standard polychloroprene contact adhesives without glue starvation.
- Rapid Action: Requires no lengthy curing—bonding cement can be applied shortly after application.
- Amber Glass Packaging: Preserves the active polymer solution against UV degradation and atmospheric moisture.
Recommended Materials & Applications:
- Automotive Trimming & Restoration: Rebuilding worn seat bolsters, repairing car seat cushions, attaching scrim foam backing, bonding headliners, and restoring campervan insulation.
- Furniture Upholstery: Repairing high-density and soft polyurethane seating foam, custom armrest cushions, and acoustic padding.
- Footwear & Orthopaedics: Priming soft PUR shoe soles, orthotic footbeds, and lightweight polyurethane wedge midsoles.
- General Foam Bonding: Joining soft or open-cell polyurethane foam to leather, vinyl, wood, metal, and composite substrates.
Usage & Application Guide:
1. Surface Preparation:
• Sand or grind the PUR foam surface lightly to expose a clean, fresh surface.
• Press the foam firmly with clean absorbent paper to remove any residual moisture, mold-release agents, or oils.
2. Primer Application:
• Apply a uniform, thin coat of Renia Primer für PUR to the prepared foam surface using a clean brush.
3. Adhesive Application:
• Allow the primer to penetrate and dry (approx. 5–10 minutes).
• Apply your contact adhesive (Colle de Cologne, Multi-Colle, or Top-Fit) to BOTH mating surfaces as normal.
4. Pressing & Assembly:
• Assemble parts within the adhesive’s open time.
• Apply light to moderate pressure (1–1.5 bar). Caution: Do not over-compress or deform soft foam during pressing to avoid damaging the foam structure.
Technical Data:
- Function: Polyurethane Surface Primer & Foam Reinforcer (PUR-Verfestiger)
- Compatibility: Polyurethane (PUR) soft foam, PUR soles, and microcellular foam
- Adhesive Partner: Renia Colle de Cologne, Multi-Colle, Top-Fit, ReGuMet
- Packaging: 100 ml Amber Glass Bottle
- Storage: Keep bottle tightly sealed in a cool, dry place at 10–25°C
PRECAUTIONS & SAFETY:
FOR PROFESSIONAL USE ONLY. Flammable liquid and vapour. Use only in well-ventilated areas or under forced extraction. Keep away from heat, hot surfaces, sparks, open flames, and ignition sources. Avoid inhalation of vapours and contact with skin/eyes. Consult Safety Data Sheet (SDS) at ……. before use.
FOR PROFESSIONAL USE ONLY. Flammable liquid and vapour. Use only in well-ventilated areas or under forced extraction. Keep away from heat, hot surfaces, sparks, open flames, and ignition sources. Avoid inhalation of vapours and contact with skin/eyes. Consult Safety Data Sheet (SDS) at ……. before use.







