6. Technician A says that an improper hose length may cause a pressure drop in the air line. Who is right? Grit refers to the problem of solid particles of varying sizes being embedded in the surface of your paint. The defect is the appearance of small holes in dried paint film. To avoid this, make sure that you prepare the surface properly by properly sanding, cleaning and using the correct primer. The defect may be due to not cleaning the surface before painting, using the wrong solvents in spray painting or incorrect air pressure. When you spray on a coating of primer or paint, fisheyes might result. Required fields are marked *. When you lose adhesion between your paint and its substrate, sections of the color may separate away. Hot spot are areas on the casting which is harder than the surrounding area. How much reducer is required? The image below again depicts extreme … Paint Booth Basics, Choosing The Right Paint Booth For You. An orange-peeled surface has the appearance of an orange peel. They also occur when the plastic flows through sections with varying wall thickness, or when the injection speed is too low causing the plastic to solidify at different speeds. Then, spray a sealer over it and reapply the color. This happens when your paint is soft after it is dry, making it susceptible to water spotting and fingerprints for days after your paint job. These are crater-like circular openings that may appear either while you are spraying your primer or paint on or directly after it has been applied. Mottling can be caused by a bunch of factors, among them are an unbalanced spray pattern, tilting the spray gun so the fan is heavier either at the top or bottom of the pattern… Technician A says that a figure "8" spray pattern is caused from atomizing air pressure being too low. In some cases, several defects may occur simultaneously and hinder the determination of the causes and redemption works. In areas with high humidity levels, blushing can happen when the evaporation of the solvent reduces the surface temperature below the dew point. can you help please ? A PROPER spray pattern is: Uniform. If the defect is inverted, obstruction is on the air cap. Compared to solvent-borne products, waterborne products are: A vehicle is being refinished using HVLP spray equipment. These occur when you hold your paint gun too close to the surface, double coat a spot or move it too slowly. This issue is usually caused by the insufficient draft angle of the product, or that the core drags the product with a larger force than the cavity, causing the cavity to be scratched. These are cracks that sometimes appear in topcoats. It is important to try to paint in an environment that is as dirt- and dust-free as possible. They are caused by injecting wax into the mold cavity before the mold release spray has had time to dry. You can fix this problem by adding retarder to the paint mixture and recoating the area. It hit between the crown and liner, which burned through the piston. Always thin your paint according to the instructions on the label and do not overcoat your surface. After painting some small parts , as the paint dried it “rain bowed” obvious oil was present.changed oil seperator cleaned gun and air hose. Other causes are caustic etch spray or accidental spillage of caustic chemicals. This can happen when you paint over body filler or glazing putty, and it appears as a yellow stain in the topcoat. Technician B says that a non-contact thermometer may be used. the paint that was put on looks yellow as a base think etch primer, then grey primer then colour, . Mottling can be caused by a bunch of factors, among them are an unbalanced spray pattern, tilting the spray gun so the fan is heavier either at … This requires stripping and refinishing to fix. Technician B says that a vacuum is used to draw the material up a siphon feed spray gun. Determine if the obstruction is on the air cap or the fluid tip. Technician B says that the term curing is used to describe the evaporation of solvents from the material. The damage below is again due to a faulty injector spray pattern. Technician B says that the air pressure should be adjusted at the spray gun with the trigger depressed and the fan control wide open. A wax and grease remover while you are preparing to paint when it is too cold are painting over cracked... Pressure or not reducing the paint a result of using too low of pressure or not reducing the paint and... Paint mixture and recoating the area with 1200-grit sandpaper and then polishing it help determine proper.... The air line move it too slowly you begin leaving craters behind causes and redemption works products... Area with 1200-grit sandpaper and then sanding and re-spraying to paint when it is important to try to in. 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