a 0 5 wt concentration of sicl 4 in the same manner as in embodiment 1 a water repellent glass substrate is obtained also with this repellent glass substrate as shown in the table 1 superior results can be obtained in the initial contact angle and the durability i e the weather resistance test and the abrasion test after the undercoating treatment using tetrachlorotin or tetrachlorozirconium as the agent for the undercoating treatment in place of chlorosilane the water repellent glass substrate was produced by using the above mentioned agent b for water repellent treatment thereof though they show 106 u00b0 for the initial contact angle however the initial critical inclination angles thereof became large such as 18 u00b0 and 19 u00b0 and the contact angles after the weather resistance test were reduced to 65 u00b0 and 64 u00b0 respectively the water repellent glass substrate was produced in the same manner as in embodiment 1 except that as the solvent for the undercoating treatment liquid chloroform was used in place of ethanol though table 1 shows a large contact angle at 107 u00b0 however the initial critical inclination angle is large such as 20 u00b0 and the contact angle after the weather resistance test was reduced to 63 u00b0 and the contact angle after the abrasion test was also reduced to 67 u00b0 comparison 6 was performed for double checking embodiment 6 which is disclosed in the specification of japanese patent no 2 525 536 namely the water repellent glass substrate was obtained in the same.