OTHER DEFECTS

SAGGING

Causes:

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

Prevention:

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

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).

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.

BAD LEVELLING

Causes:

  • Unsuitable (too high) viscosity.
  • Unsuitable application technique.
  • Unsuitable working temperature.
  • Use of unsuitable THINNER.
  • Unsuitable spray gun (nozzle), pressure.

Prevention:

  • Follow technical instructions for use – viscosity and temperature.
  • Use of prescribed spray gun (nozzle).
  • Use of prescribed THINNER.

POPPING

Causes:

  • Incorrectly dried-through filler.
  • trapping of solvents and air because of too high film thickness.
  • No flash off between coats.
  • Wrong HARDENER and THINNER.
  • Interrupted drying (not following drying time).

Prevention:

  • Apply the prescribed coat thickness.
  • Wait between the first and the second coat 10 – 15 min. /20 °C or until mark-free surface.
  • Regular check of activation and temperature of a drier.
  • Follow prescribed flash off times between coats and final flash off.
  • Use the prescribed HARDENER and THINNER.

SANDY SURFACE

Causes:

  • Isocyanate HARDENER for 2K materials reacted with air humidity.

Prevention:

  • Use up open packaging of isocyanate hardener as soo as possible or close it tightly.
  • Check quality of a hardener before repeated use – it should be clear, colourless, fluently running, without any floating particles.