A sacrificial film-forming composition is provided comprising (A) a silicone resin which is a co-hydrolytic condensate of hydrolyzable silanes having formulae (1) and (2): X--Y--SiZ.sub.3 (1) R.sub.nSiZ.sub.4-n (2) wherein Z is a hydrolyzable group, X is a crosslinkable organofunctional group such as an unsubstituted hydroxyl group or a substituted or unsubstituted epoxy, acyloxy or acryloxy group, Y is a single bond or a divalent hydrocarbon group, R is hydrogen or a monovalent hydrocarbon group, and n is an integer of 0 to 3, the silicone resin being capable of crosslinking reaction by the crosslinkable organofunctional group in formula (1), (B) a crosslinking agent, (C) an acid generator, and (D) an organic solvent. The composition has improved storage stability, filling properties, adhesion and coating uniformity sufficient to form a sacrificial film which is effectively dissolvable in a stripping solution.