Final answer:
For a spiral rod set, hair needs to be completely dry, otherwise, the style will likely cause frizz. Damp hair can disrupt the setting process and lead to a frizzy appearance, compromising the hairstyle.
Step-by-step explanation:
When preparing a spiral rod set, if the hair is not completely dry, the style will likely cause frizz. Proper drying of the hair is essential when styling to ensure that the curls formed by the rods are set correctly and maintain their shape without unwanted frizz or puffiness. If the hair remains damp, it can disrupt the setting process, leading to a frizzy appearance and potentially compromising the longevity and quality of the hairstyle.