Why must body filler be mixed properly?

Why must body filler be mixed properly?

• A. To ensure faster curing
• B. To achieve a lighter color
• C. To reduce weight
• D. To ensure proper curing and strength

Answer: (D)

Mixing proper proportions of body filler and hardener controls the chemical reaction that makes the filler set hard and gain strength. If the mix is correct, the filler cures evenly, adheres well to the metal, and can be sanded and shaped without crumbling or cracking. Improper ratios can cause under-curing, leaving a soft, weak, or tacky surface that can fail under sanding or paint, or over-curing and becoming brittle or prone to shrinking. Color and weight aren’t affected by mixing accuracy, so they aren’t the goal of the mix. That’s why ensuring proper curing and strength is the essential reason to mix it correctly.