A liquid crystal cell is prepared by bonding a pair of oppositely disposed electrode plates with a sealant of a one-pack type epoxy adhesive to define a space to be filled with a liquid crystal. In advance of the use, the one-pack type epoxy adhesive is modified with an amine-type room temperature hardener to selectively reduce a low-molecular weight fraction in the epoxy adhesive so as to avoid a sealant flow at an elevated temperature. This is particularly advantageous when the sealant is used in combination with a particulate adhesive which is disposed in the liquid crystal space and activated at such an elevated temperature to bond the electrode plates while keeping an accurate gap between the electrode plates.