Related Clues:

• Many a toothpaste
• Become more solid
• Hair fixative
• Coiffeur's goop
• Hairdo goo
• Crystallize
• Hair-salon application
• Stylist's goop
• Stage light covering
• Mousse cousin
• Toothpaste, often
• Pen filler, perhaps
• Colloid
• Firm up, in a way
• Glue is one