Red Seal Automotive Refinishing Technician Practice Exam

What is a common mixing ratio for a two-component automotive paint?

1. 1:1

2. 2:1

3. 3:1

4. 4:1

The correct answer is: 2:1

A common mixing ratio for two-component automotive paint is often 2:1, meaning that for every two parts of the base paint, one part of the hardener or activator is added. This ratio is widely used because it allows for optimal chemical reactions between the paint and the hardener, ensuring the durability and performance characteristics that are critical in automotive refinishing. Using the 2:1 ratio permits the paint to cure properly, which affects its adhesion, hardness, and overall longevity. Different paints and products may have varying recommended mixing ratios based on their specific chemical formulations, but the 2:1 ratio is prevalent among both solvent-based and waterborne paints, making it essential for technicians to be familiar with this standard. Understanding this ratio also helps in achieving the desired finish and avoiding issues such as incomplete curing or compromised paint integrity.