Term: after-tack

In painting and coatings, "after-tack" refers to a condition where a painted or coated surface, although it appears dry to the touch, retains a slight stickiness or tackiness after the expected drying time has passed. This can occur hours or even days after application.

Causes of After-Tack:

• Improper drying conditions (e.g., high humidity, low temperature)
• Incompatible paint layers (e.g., applying a topcoat over an uncured undercoat)
• Excessive film thickness
• Use of slow-drying or poor-quality products
• Contamination (e.g., oil, silicone, or other residues on the surface)

Why It Matters:

After-tack can lead to:

• Dust and dirt pickup
• Blocking (surfaces sticking together, such as doors and windows)
• Poor durability and finish quality

Prevention:

• Follow manufacturer’s recommended drying times and conditions
• Ensure proper surface preparation
• Apply paint in appropriate environmental conditions
• Avoid over-application

In the Australian painting industry, managing after-tack is crucial for ensuring a professional, long-lasting finish, especially in high-traffic or high-touch areas.