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