Term: induction time

In the context of painting and coatings, "induction time" refers to the period that a mixed two-component (2K) product—such as an epoxy or polyurethane paint—must sit after mixing and before application. This waiting period allows the chemical reaction between the components (typically a base and a hardener or catalyst) to begin and reach a suitable state for proper application and performance.

Key Points:

• Applies to: Two-pack (2K) systems like epoxies, polyurethanes, and some industrial coatings.
• Purpose: Ensures proper chemical activation and consistency of the product.
• Duration: Varies by product—can range from a few minutes to over 30 minutes. Always specified in the product's technical data sheet (TDS).
• Failure to observe induction time can lead to:
  • Poor adhesion
  • Incomplete curing
  • Surface defects (e.g., blushing, pinholing)
  • Reduced durability or chemical resistance

Example:

If a two-pack epoxy specifies an induction time of 10 minutes, you must wait 10 minutes after mixing the base and hardener before applying it to the surface.

Always refer to the manufacturer’s instructions for the correct induction time and application guidelines.