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 The alkalis from the cement attack the oil in the alkyd resin • Avoid using alkyd- Your email address will not be published.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