What happens if too much hardener is added to filler?

What happens if too much hardener is added to filler?

• A. It may cure too quickly and become brittle
• B. It will be softer
• C. It won't cure at all
• D. It becomes more flexible

Answer: (A)

Hardener is the catalyst that starts the polyester resin’s cross-linking, so the amount you mix directly controls how fast it cures and how the finished film behaves. When you add too much hardener, the reaction happens very quickly, shortening the pot life and causing the filler to cure almost immediately. That rapid cure creates a hard, stiff film that tends to be brittle and prone to cracking or chipping under stress. It also becomes difficult to sand smoothly because there isn’t enough working time to shape it before it hardens. So the best answer is that it may cure too quickly and become brittle. If you don’t add enough hardener, the filler would stay soft or not cure properly, which is the opposite of what happens with too much hardener.

Hardener is the catalyst that starts the polyester resin’s cross-linking, so the amount you mix directly controls how fast it cures and how the finished film behaves. When you add too much hardener, the reaction happens very quickly, shortening the pot life and causing the filler to cure almost immediately. That rapid cure creates a hard, stiff film that tends to be brittle and prone to cracking or chipping under stress. It also becomes difficult to sand smoothly because there isn’t enough working time to shape it before it hardens. So the best answer is that it may cure too quickly and become brittle. If you don’t add enough hardener, the filler would stay soft or not cure properly, which is the opposite of what happens with too much hardener.