OTHER DEFECTS

BLISTERS

Causes:

  • Too short flash off times between coats.
  • Too thick primer coats.
  • Water residue from sanding in corners, edges, folders and under decorative borders.
  • Water hardness for sanding is too high.
  • Polluted compressed air.
  • Too high air humidity (over 80 % at 2K materials).
  • Condensed water due to temperature fluctuations.

Prevention:

  • Flash off between coats min. 10 min/20 °C.
  • Maximum application 80µm at HS filler and max. 40µm at MS filler.
  • If possible, always dismantle component parts.
  • Blow off carefully.
  • Do not allow water residue from sanding to dry, you should wipe them clean.
  • Compressed air should be dry and clean.
  • Avoid the formation of condensed water; keep a stable temperature and humidity.

Repair of incurred defect:

  • Sand to bare metal and repeat painting of a primer according to instructions.

TRACES OF SANDING PAPER IN A TOPCOAT

Causes:

  • Sanding of the primer with unsuitable (too rough) abrasive paper.
  • Sanding with unsuitable (too rough) abrasive paper on old lacquering.
  • Insufficient putty isolation prior to application of topcoat.
  • Too low viscosity of topcoat.

Prevention:

  • Use abrasive paper of prescribed grit.
  • Sand rough cracks with a fine abrasive paper.
  • Isolate thoroughly puttied repairs with a filler.
  • Follow the prescribed viscosities of top coats.

Repair of incurred defect:

  • Sand to bare metal and repeat painting of a primer according to instructions.

BAD ADHESION TO THE SURFACE

Causes:

  • Badly prepared surface, grease traces, fingerprints, powder, dust etc.
  • Use of materials, not suitable for some types of metals.
  • thinning of material with unsuitable (not original) thinner.

Prevention:

  • Clean surface thoroughly before painting.
  • Always check, which material to apply to a certain type of metal.
  • Use of recommended thinners.

Repair of incurred defect:

  • Sand to sheet metal and repeat painting of a sealer according to instructions.
  • Take care to use the correct 2K primer / filler with regard to surface.

Soaking of a surface

Causes:

  • Not dried through, not cured old enamel.
  • Too high coat thickness of old enamel.

Prevention:

  • Follow the prescribed drying time.
  • Follow the prescribed coating thickness.

Repair of incurred defect:

  • Sand to bare metal and repeat painting of a primer according to instructions.