PURPOSE: To permit economical marking with a simple operation by sticking a pressure sensitive type self-adhesive sheet to the surface of a coated film contg. a tar component.

CONSTITUTION: Marking is executed by sticking the pressure sensitive type self-adhesive sheet to the surface of the coated film contg. the tar component. This pressure sensitive type self-adhesive sheet consists of a pressure sensitive type self-adhesive agent and base material and is obtd. by adequately combining the pressure sensitive type self-adhesive agent with an essential material (e.g.; chlorinated rubber) and if necessary, self-adhesive assistant known heretofore (e.g., ester gum), and plasticizer (e.g., castor oil). For example, a PVC resin is used for the base material. Bleeding is prevented and in addition, the excellent bleeding resistance and adhesiveness is attained without being affected by the drying characteristic of the paint contg. the tar component if the marking is executed by sticking such pressure sensitive type self-adhesive sheet. Economical marking is thus executed by a simple operation.