Possible Clues:

• Cuts up the company on the outside
• Decorative external plaster
• Plaster product
• Plaster covers up backing that's left out
• Outer layer immovable, endlessly firm
• Returned shares with company that goes to the wall
• Exterior masonry finish
• Plaster for coating or moulding
• Finish made from cement or plaster
• Plaster not entirely fixed? Firm underneath