PURPOSE: To obtain a film-forming compsn. having excellent heat resistance, adhesion and film-forming properties, consisting mainly of an organosilicon condensate having no terminal silanol group, frit and a specified metallic powder.

CONSTITUTION: A compsn. consists mainly of an organosilicon condensate (A) having no terminal silanol group obtd. by hydrolyzing a mixture of an organosilicon compd. of formula I (wherein R is a 1W8C hydrocarbon group) and/or its lower condensate and an organosilicon compd. of formula II (wherein R' is a 1W2C hydrocarbon group) and/or its low condensate in the presence of an acid catalyst, adjusting the pH of the mixture to not lower than 7 by adding an alkaline material and condensing the products, frit (B) and at least one metallic powder (C) selected from the group consisting of zinc, manganese and lead powders. If desired, an inorg. pigment, starting materials for glass, inorg. additives, etc., may be added thereto.