How to deal with " pinholes " after car paint spraying?
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How to deal with " pinholes " after car paint spraying?
"Pinholes" are also called pits, which are densely packed small holes that appear in the paint film.
(1) Causes:
① The compressed air used for spraying contains moisture, or the wrong type or quantity of thinner is used in the paint.
② Excessively thick wet coating, or forced drying with a hair dryer, or the temperature of the spraying workshop is too high or too low.
(2) Correction method:
① The discharge valve of the air compressor that provides the air source should be opened every day to allow the accumulated water to flow out.
②Avoid excessive thick coating, medium film thickness ensures correct solvent evaporation. Do not blow dry wet painted surfaces as this may cause surface skinning or solvent entrapment in the film.
③Strictly follow the drying rules. Choose the correct thinner and dilute according to the recommended ratio.
④Use the correct spray gun and adjust the pressure to ensure good atomization effect.
⑤ If pinholes occur, polish them until they are smooth and repaint them.
