A long range attractive force occurs between freshly molten glass surfaces in water vapor. The attraction extends to distances of micrometers. The effect is more pronounced for low melting glasses with a high soda content. It is due to dissolution of the silica matrix components in vapor condensate which forms thick films of aqueous electrolyte on the surfaces. The attraction results from the springing action of the capillary annulus which bridges the surfaces together. The effect occurs in water vapor but not with vapors of other liquids. Some hydrophobic surfaces in water are known to show similar effects.