Which of the following is NOT a proper care instruction for a plaster leg cast?

Exposing a plaster leg cast to heat to dry faster is not a proper care instruction because it can compromise the integrity of the cast and potentially lead to burns on the skin underneath. Plaster casts are designed to harden and set through a chemical reaction that occurs with moisture rather than heat. Applying heat can cause the plaster to dry unevenly or too quickly, increasing the risk of cracking and reducing the support necessary for proper healing.

Keeping the cast dry, elevating it to reduce swelling, and monitoring for signs of infection are essential care instructions. Keeping the cast dry prevents moisture from weakening the plaster. Elevating the limb helps control swelling by reducing blood flow to the area. Monitoring for signs of infection, such as increased redness, warmth, or discharge, is crucial for identifying complications early and ensuring proper healing.