what does liquid rubber not stick too

2 min read 25-12-2024

Liquid rubber, also known as rubber coating, is a versatile product with numerous applications. Its strong adhesive properties make it ideal for waterproofing, sealing, and protecting various surfaces. However, understanding what liquid rubber doesn't stick to is equally important for successful application. This guide explores the materials liquid rubber struggles to adhere to and offers solutions for overcoming these challenges.

Understanding Liquid Rubber Adhesion

Liquid rubber's stickiness comes from its polymer composition and the chemical reaction it undergoes during curing. A properly prepared surface is crucial for optimal adhesion. Cleanliness, dryness, and surface texture all play significant roles.

Surfaces Liquid Rubber May Not Stick To

Several materials present challenges for liquid rubber adhesion. These include:

1. Highly Porous Materials

Extremely porous materials like some untreated woods or highly absorbent bricks can absorb the liquid rubber before it can cure properly. This leads to poor adhesion and potential peeling.

Solution: Apply a primer specifically designed for porous surfaces before applying liquid rubber. This creates a barrier and improves adhesion.

2. Oily or Greasy Surfaces

Any oil, grease, or silicone residue will prevent liquid rubber from bonding effectively. These substances repel the rubber, creating a weak bond.

Solution: Thoroughly clean the surface with a degreaser and allow it to dry completely before application. Consider using a solvent to remove stubborn residues.

3. Certain Plastics

Some plastics, particularly those with non-porous, smooth surfaces like polyethylene (PE) or polypropylene (PP), have low surface energy. This means liquid rubber has difficulty forming a strong bond.

Solution: Specialized primers or adhesives formulated for plastics might be necessary to improve adhesion. Abrading the surface slightly can also help create better mechanical grip.

4. Wet or Damp Surfaces

Moisture interferes with the curing process and prevents proper adhesion. The liquid rubber won't bond effectively to a wet surface.

Solution: Ensure the surface is completely dry before applying liquid rubber. Allow ample time for drying, especially in humid conditions.

5. Loose or Flaking Surfaces

If the underlying surface is already loose, cracked, or flaking, the liquid rubber won't have a stable base to adhere to.

Solution: Repair or remove the damaged surface before applying liquid rubber. Ensure the underlying surface is sound and stable.

6. Some Treated Woods and Metals

Certain wood sealants or metal coatings can create a barrier, preventing good adhesion. Always check the compatibility of your chosen sealant with liquid rubber.

Solution: Test a small area first to ensure compatibility. If necessary, you might need to remove the existing sealant. For metals, ensure proper surface preparation, including cleaning and possibly etching.

Preparing for Success: Best Practices

Regardless of the surface, proper preparation is key. These steps maximize the chances of successful liquid rubber adhesion:

Thorough Cleaning: Remove all dirt, dust, debris, oil, grease, and loose particles.
Surface Drying: Ensure the surface is completely dry before application.
Primer Application (When Necessary): Use a suitable primer to enhance adhesion on challenging surfaces.
Following Manufacturer Instructions: Always follow the manufacturer's instructions regarding application, curing time, and environmental conditions.
Testing: Always test a small, inconspicuous area before applying liquid rubber to the entire surface.

By understanding the limitations of liquid rubber adhesion and following these best practices, you can achieve successful and long-lasting results in various applications. Remember to always consult the manufacturer's instructions for your specific product.