If fisheyes appear in a basecoat, allow the color to flash then spray a mist coat over affected area. 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. In other words, the coating of the paint is not enough to cover the background seen. A paint defect is in many cases due to a number of causes. Alkyd-type coatings that are applied to galvanized metal (zinc) fail because the corrosion products of zinc are alkaline. Your email address will not be published. In this article we explain the defects 'Runs, sags and curtains'. The byproduct is soap ( The root word “sapo” in Latin is soap). Symptoms: The coating is not resistant to alkali. This defect occurs when the surface to be painted is too smooth. Saponification defect … You can follow me on Instagram. generally adaptable for all paint formulations. (9) Saponification: The grinning defect is formed due to the inadequate coating of the paint. Saponification. Geotechnical-Material Engineer. Saponification is a potential problem after applying paint or a coating to concrete or another surface. During paint inspections, our surveyors see a lot of paint defects passing by. Improving ventilation and increasing direct daylight, if practicable, will help to prevent yellowing of the new paint. 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. To know more about me just visit AboutMe. Saponification is a chemical reaction that occurs when oil product is mixed with an alkali. Blisters appear, paint … The paint runs back and leaves small areas of surface uncovered. Suryakanta. When saponification has occurred, the surface must be stripped, washed and allowed to dry out completely before repainting. Do not use fisheye eliminator in undercoats or basecoat color. About The Author. (8) Sagging: When a vertical or inclined surface is too thickly painted, the defect of sagging occurs. Touch up bare spots with primer/undercoat and finish with topcoat. You can connect me on Google +. 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. 6. Sheen Sealer: Paint used to seal the substrate or previous coats and prevent interaction between subsequent coats applied. 7KLQQHUV VKRXOG EH DGGHG VORZO\ DQG ZLWK FRQVWDQW stirring. The alkalis from the cement attack the oil in the alkyd resin • Avoid using alkyd- Add a Comment Cancel reply. After the appropriate pretreatment, a new system should be applied. As the defect is more obvious with white paint, it may be better to use a pastel colour for repainting. Add the recommended fisheye eliminator and respray the affected area. This defect is the development of soap patches on the painted surface. Saponification. A paint saponification failure mechanism can be further supported by the location of the failures on the building. Saponification Defect of Paint. 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 Required fields are marked * In some cases, several defects may occur ... Saponification • Use of alkyd-based paints on cement based materials. Paint layers that are not sound should be removed. 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