What is the purpose of cure retardants in hot or dry conditions?

What is the purpose of cure retardants in hot or dry conditions?

• A. They speed up drying
• B. They slow evaporation, reduce cracking, and improve surface quality
• C. They add color
• D. They replace water in mix

Answer: (B)

In hot or dry conditions, moisture in plaster or cement dries out too quickly, causing the surface to skin over and crack before full hydration can occur. Cure retardants slow the rate of evaporation, keeping moisture in the mix longer so hydration can continue evenly throughout the material. This reduces plastic shrinkage cracks, minimizes surface crazing, and yields a smoother, higher-quality finish. They also help the mix stay workable longer, which improves the finishing result. The other options don’t fit because cure retardants do not speed up drying, add color, or replace water in the mix. They specifically slow evaporation to support proper curing.

In hot or dry conditions, moisture in plaster or cement dries out too quickly, causing the surface to skin over and crack before full hydration can occur. Cure retardants slow the rate of evaporation, keeping moisture in the mix longer so hydration can continue evenly throughout the material. This reduces plastic shrinkage cracks, minimizes surface crazing, and yields a smoother, higher-quality finish. They also help the mix stay workable longer, which improves the finishing result.

The other options don’t fit because cure retardants do not speed up drying, add color, or replace water in the mix. They specifically slow evaporation to support proper curing.