In other words, the coating of the paint is not enough to cover the background seen. The grinning defect is formed due to the inadequate coating of the paint. In some cases, several defects may occur ... Saponification • Use of alkyd-based paints on cement based materials. A paint saponification failure mechanism can be further supported by the location of the failures on the building. As the defect is more obvious with white paint, it may be better to use a pastel colour for repainting. Paintwork is defective if application defects or blemishes such as paint runs, paint sags, wrinkling, dust, bare or starved painted areas, colour variations, surface cracks, irregular and coarse brush marks, sanding marks, blistering, uniformity of gloss level and other irregularities in the surface that are visible from a normal viewing position. This defect occurs when the surface to be painted is too smooth. 7KLQQHUV VKRXOG EH DGGHG VORZO\ DQG ZLWK FRQVWDQW stirring. Add the recommended fisheye eliminator and respray the affected area. Sealer: Paint used to seal the substrate or previous coats and prevent interaction between subsequent coats applied. Alkyd-type coatings that are applied to galvanized metal (zinc) fail because the corrosion products of zinc are alkaline. Suryakanta. (8) Sagging: When a vertical or inclined surface is too thickly painted, the defect of sagging occurs. Saponification. 6. Do not use fisheye eliminator in undercoats or basecoat color. The alkalis from the cement attack the oil in the alkyd resin • Avoid using alkyd- The byproduct is soap ( The root word “sapo” in Latin is soap). A paint defect is in many cases due to a number of causes. Saponification is a chemical reaction that occurs when oil product is mixed with an alkali. This defect is the development of soap patches on the painted surface. Geotechnical-Material Engineer. Symptoms: The coating is not resistant to alkali. Saponification is a potential problem after applying paint or a coating to concrete or another surface. You can follow me on Instagram. After the appropriate pretreatment, a new system should be applied. The paint runs back and leaves small areas of surface uncovered. Improving ventilation and increasing direct daylight, if practicable, will help to prevent yellowing of the new paint. Sheen About The Author. Look for specific locations of paint adhesion failure, contrasted with a more uniform paint adhesion failure over all of the structure, on all sides and locations. Required fields are marked * Your email address will not be published. Saponification Defect of Paint. Saponification. (9) Saponification: Add a Comment Cancel reply. Paint layers that are not sound should be removed. To know more about me just visit AboutMe. Saponification: A coating defect caused by the reaction of the binder with the substrate or attack of the film by an alkali resulting in a "soapy" film. Remove wet paint film with solvent, clean and refinish. If fisheyes appear in a basecoat, allow the color to flash then spray a mist coat over affected area. Adding a large amount all at once may result in local over-dilution and may cause curdling of the paint or ÀRFFXODWLRQ RI WKH SLJPHQW 7KLV SUHFLSLWDWLRQ PD\ DSSHDU to stir in, but that portion of the mix that has (60°F)curdled or You can connect me on Google +. During paint inspections, our surveyors see a lot of paint defects passing by. In this article we explain the defects 'Runs, sags and curtains'. generally adaptable for all paint formulations. Blisters appear, paint … Touch up bare spots with primer/undercoat and finish with topcoat. When saponification has occurred, the surface must be stripped, washed and allowed to dry out completely before repainting. If saponification occurs, then the adhesive strength of the coating can suffer; over time the coating chips off, exposing the inner surface to the corrosive environment. 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