To enhance long time reliability of an organic EL device or others having an organic EL element package by devising a sealing material paste capable of forming a sealing material layer excellent thick after firing and excellent in surface smoothness, a method for coating the same, and a glass substrate with a sealing material layer using the same.

A sealing material paste includes inorganic powder and vehicle, the inorganic powder includes SnO-containing glass powder and pigment, the vehicle includes resin binder and solvent, contents of the inorganic powder, the resin binder, and the solvent are 42 to 52, 8 to 18, and 35 to 45 in terms of mass ratio, respectively.