Adhesion Failure

Problem Description:

Adhesion failure occurs when the paint does not sufficiently bond to the surface, causing the paint layer to detach or peel off. Improper adhesion can lead to significant aesthetic and durability issues.

Possible Causes:

• Inadequate Surface Cleaning: Failure to properly clean the surface before painting, leaving dust, dirt, grease, or old paint residues, prevents proper adhesion. On unclean surfaces, the adhesion rate can decrease significantly.
• Incorrect Paint Selection: Using paint unsuitable for the substrate type (e.g., metal paint on wood) adversely affects adhesion capacity. In such cases, adhesion rates can drop by up to 50%.
• Insufficient Surface Preparation: Lack of surface roughness or failure to perform necessary sanding weakens paint adhesion. Especially if old paint layers are not completely removed, new coats may have difficulty adhering.
• Oily or Dirty Surfaces: Grease and dirt layers on the surface inhibit adhesion and can reduce paint bonding by 40-50%.
• Unsuitable Environmental Conditions: If temperature and humidity during application are not within the recommended range (temperature below 18°C or above 24°C, humidity below 45% or above 65%), the paint may not dry properly, leading to adhesion problems.

Solutions and Precautions:

• Thorough Surface Cleaning: Ensure the surface is completely free of dust, dirt, grease, and old paint residues before painting. Proper cleaning can increase adhesion by up to 50%.
• Surface Preparation and Sanding: Perform necessary sanding to create a smooth and even surface. Sanding before painting can enhance adhesion capacity by approximately 40%.
• Correct Paint Selection: Choose paints appropriate for the substrate. For example, using primers and paints designed specifically for wood can improve adhesion by about 35%.
• Use of Primer: Applying primer, especially on uneven surfaces, improves paint bonding. Primer use can increase adhesion success by around 20%.