A highly desirable property of metals like gallium and indium is that they are able to wet glass.
Normally, as metals, they wouldn't be able to form an airtight seal when in contact with glass. But they are able to do so, and they can be used in applications where an airtight seal is required (e.g. vacuum gaskets).
That said, indium and gallium are somewhat expensive (at press time, around 700 USD/kg and 250 USD/kg, respectively). Industrial compounds that also have similar properties, such as Galinstan (even though the glass still needs a wetting with gallium oxide first), aren't much better.
What are some metal substances that are both cost-effective and able to wet glass with an airtight seal that can be used in industrial applications?