Final answer:
A styling lotion or light hold hair gel is typically used for finger-waving, as it allows hair to be shaped without becoming too stiff, unlike hair spray which can leave the hair 'crunchy'.
Step-by-step explanation:
The type of hair gel that makes hair pliable enough to keep it in place during the finger-waving procedure is different from hair spray. Hair spray is typically used to stiffen hair into a certain style and is known for leaving the hair feeling 'crunchy' unless brushed out. Finger-waving usually requires a product that provides a flexible hold and can be molded. Thus, for finger-waving, a styling lotion or light hold hair gel that allows the hair to be shaped and sculpted without becoming too stiff is more appropriate. These products often contain ingredients that allow the hair to be manipulated while styling but also help retain the shape once it dries, in conjunction with the temporary structural changes in the hair's hydrogen bonds.