A 4-year-old child sustains a fall at home. After an x-ray examination, the child is determined to have a fractured arm and a plaster cast is applied. The nurse provides instructions to the parents regarding care for the child's cast. Which statement by the parents indicates a need for further instruction?

1. "The cast may feel warm as the cast dries."
2. "I can use lotion or powder around the cast edges to relieve itching."
3. "A small amount of white shoe polish can touch up a soiled white cast."
4. "If the cast becomes wet, a blow drier set on the cool setting may be used to dry the cast."