OTHER DEFECTS

CLOUDINESS

Causes:

  • Unsuitable application technique (nozzle, pressure).
  • Too short flash off times.
  • Use of unsuitable thinner.
  • The painted suface has no adequate temperature (too cold or too warm).

Prevention:

  • Use of the prescribed application technique.
  • Use of a prescribed thinner.
  • Assure a suitable surface and room temperature (18 ˚C – 20 ˚C), where you paint.
  • Work in room humidity range of 40 – 60%.

Repair of incurred defect:

  • Sand to the primer and repeat painting of base enamel according to instructions.

Deviation of colour shades

Causes:

  • Not following the prescribed conditions for application (nozzle, pressure, distance of a gun).
  • Incorrect spraying technique: too wet, too dry or, not covering.
  • Surface damaged due to weather influences and use of unsuitable cleaners.
  • Deviation in serial painting process.
  • Using a badly mixed colour shade.

Prevention:

  • Follow the prescribed application conditions.
  • Spray with “fade out” technique.
  • Tinting at partial painting.
  • Prior to use, mix colour shade thoroughly.

Repair of incurred defect:

  • Sand to the primer and then repeat the painting process according to instructions.

CRATERS

Causes:

  • Wax, grease, silicone contaminated surface.
  • Compressed air contaminated through condensed air or oil residue.
  • Use of silicone, polishing agents or sprays in the vicinity of painting area.
  • Insufficiently cleaned surface before coating.

Prevention:

  • Before starting painting, clean thoroughly with MOBIHEL Antisilicone cleaner low VOC.
  • Regular maintenance of oil and water separators (filters).

Repair of incurred defect:

  • Sand to filler and repeat painting of topcoat as prescribed.

Sagging

Causes:

• Incorrect viscosity of MOBIHEL Base.
• Too high film thickness of MOBIHEL Base.
• Unsuitable spray gun (nozzle), pressure.
• Too cold material, substrate or too low room temperature.
• Use of unsuitable thinner.

Prevention:

• Follow technical instructions for use.
• Use a suitable spray gun.
• Warm the object and material to room temperature 20 °C.
• Use a recommended thinner.

Repair of incurred defect:

• Sand to the filler and repeat painting of MOBIHEL Base according to instructions.

MATT EFFECT (GLOSS DECREASE)

Causes:

  • Too high coat thickness MOBIHEL 2K HS 2:1 clearcoat (more than 2 coats) - too high air humidity.
  • Surface soaking.
  • Hardener defects – hardener reacted with air humidity.
  • Humidity in compressed air supply.
  • Use of unsuitable thinner.
  • Unsuitable air supply.
  • Interrupted drying.
  • No MOBIHEL Siccative added into 1K synthetic enamel (MOBIHEL enamel MIX).

Prevention:

  • Follow technical instructions for the application of material.
  • Keep hardener cans sealed properly.
  • Enable sufficient airflow (during drying).
  • Do not interrupt forced drying.
  • Follow prescribed drying times.
  • Use recommended hardener and thinner.
  • When mixing MOBIHEL enamel – mix according to formulation at the end obligatory add MOBIHEL Siccative.
  • With the 1K synthetic enamels (MOBIHEL enamel) take care of overcoating times in order to
    prevent surface soaking.

Repair of incurred defect:

  • Sand to the sealer and repeat the application of MOBIHEL 2K HS 2:1 clearcoat according to regulations.
  • Check the quality of a hardener – it should be clear, colourless, fluently running, without any floating particles.