• Flat glass surfaces (like perfume bottles or flat panels) are easier the foil is pressed directly with a flat stamping die using heat and pressure. This gives a clean, sharp metallic finish.

• Round or curved glass surfaces (like cylindrical bottles) require special flexible dies or rotary stamping to conform to the curve. The technique ensures even foil transfer without cracking or peeling.

This is commonly used for cosmetic bottles, liquor bottles, and premium packaging to give a luxurious metallic look.