Related Clues:

• Caulking
• Putty, for example
• Introductory textbook, gloss over it perhaps?
• Coat that goes on before paint
• Pre-foundation layer
• First coat of paint
• Demure queen's first coat
• First reading book
• Vacuum ___ (device for preserving food)
• Starchy hem of Eleanor's first coat
• Undercoat of paint