Abstract: Painting of an article formed of a synthetic resin, e.g. an automobile bumper formed of polyurethane resin, is accomplished by simplified operations and at reduced cost by using a paint of a desired color containing 5-40 wt % of an aprotic polar solvent, preferbly N-methyl-2-pyrrolidone. The paint is applied directly to a cleaned surface of the plastic article, followed by usual drying and baking. Application of a usual primer is omitted since the paint containing an adequate amount of aprotic polar solvent is excellent in adhesion to plastic surfaces. The obtained paint film is comparable to an ordinary top coat paint film formed on a primer layer in appearance, whether resistance and chemical resistance. When a two-toned paint coat is wished, another paint not containing any aprotic polar solvent is applied onto a selected area of the initially formed paint film, followed by drying and baking.

Abstract: A method for finish coating on polyurethane formed articles, which comprises formulating a finish coating composition so as to have a content of pyrrolidone or its derivative represented by the general formula ##STR1## in which R stands for hydrogen or an alkyl group having at the most 4 carbon atoms, in an amount of 5-40% by weight upon the coating, applying this finish coating composition on the polyurethane formed article directly and heating the so called polyurethane formed article at a temperature of at least 50.degree. C.

Abstract: In a rust preventing wax treatment method which is applicable to automobile bodies already provided with a finish coat of paint, use is made of a wax which possesses not only thixotropy but also such a temperature-sensitive property that the viscosity of the wax decreases when heated and increases again when cooled near to room temperature. In the wax treatment method the wax and/or the article to be treated with the wax is heated and the wax, which is kept under action of a mechanical force to utilize its thixotropy, is applied to desired surfaces of the article. After that the waxed article is cooled near to room temperature. By this method the wax exhibits a very low viscosity when applied to the article and therefore can penetrate even into narrow spaces, and the applied wax soon solidifies as the waxed article is cooled. Therefore, a wax coating film of a sufficient thickness can be formed without suffering from dripping of the applied wax.

Abstract: A thermoset acrylic resin composition for coating metallic materials, particularly stainless steel, having a superior adhesion thereonto and hence a superior resistance to forming after coated, and a stainless steel piece coated with a coating material comprising the above composition, followed by baking, and having a superior colorability and endurability, are provided, which composition is obtained by radical-copolymerizing (a) an acrylic or methacrylic acid ester having 1-12 C in the ester moiety, in 40-80% by weight, (b) a hydroxyl group- or epoxy group-containing acrylic or methacrylic acid ester, in 20-5% by weight, (c) a vinyl group-containing polysiloxane in 20-0.01% by weight and (d) a vinyl group-containing silane compound in 20-2% by weight, these % by weight being based on the total weight of monomers (a)-(d).

Abstract: In an automobile having an exhaust gas purifying device such as a catalytic converter beneath the floor of the vehicle body, a heat absorption layer is provided, within a space bounded on its lower and upper sides by the purifying device and an interior covering for the floor to prevent the covering from being burned in case of an abnormal rise in the temperature of the purifying device. The essential material of the heat absorption layer is a hydrate which loses its water of hydration at a temperature to which is heated the heat absorption layer in case of the abnormality.