Abstract: A floor coating composition containing one or more unsaturated urethane compounds, which is(are) obtained from an isocyanate compound(s) and a hydroxyl compound(s) as starting materials, wherein at least one of the isocyanate compound(s) and the hydroxyl compound(s) has an unsaturated bond(s), wherein the poly(alkyleneoxy) group content (as defined in the specification) is 2–16 wt % and the proportion of the number of the unsaturated bonds (as defined in the specification) is not less than 6, can form a coating film superior in staining resistance against extremely powerful staining substances and gloss retentivity against extremely great load from walking, and which permits easy polishing away of damages and color stain, as well as use of water as a solvent. When a coating object is covered with a film made from the composition, a coated material can be obtained, wherein warpage of a coating object (floor, floor material, plastic film and the like) and cracks in the film are suppressed.

Abstract: The present invention provides a method of removing a coating film from the surface of a coated product, which method includes supplying an abrasive onto the surface of a coating film, pressing the abrasive to the surface of a coating film with a press surface of a press element to crush the coating film into a crushed coating film, and removing the abrasive and the crushed coating film, and a method of removing a coating film from the surface of a coated product using a jig for pressing an abrasive onto a coating film with a press element, and crushing the coating film, wherein the jig contains a jig base and plural press elements, and the press element is connected to the jig base such that the press element can be at least displaced to elastically approach or leave the jig base.