Category Archives: EN – Defects

LACQUER CRACKING

REASONS

  • Excessive film thickness of the lacquer.
  • Using the wrong hardener.
  • Humidity is too high.
  • Improper drying, poor storage conditions.
  • The mixture pot-life has expired.
  • Unsuitable primer or lacquer.

PREVENTION

  • Apply a thinner layer of lacquer.
  • Check the hardener in the mixture.
  • Reduce the humidity level.
  • Check the drying method and storage conditions.
  • Use a fresh lacquer mixture.
  • Use a suitable primer or lacquer.

SOLUTION

  • Sand the surface down to the base/substrate.
  • Re-apply the lacquer according to the recommendations.

For more information, do not hesitate to contact us.

WOOD DISCOLORATION

REASONS

  • Water-based lacquer or enamel is not suitable for oak, beech, ash, alder.
  • Water-based lacquer is not suitable for treating wood with a large amount of resin (spruce, pine, etc.).

PREVENTION

  • Apply a suitable lacquer or enamel for the type of wood used or use a discoloration blocker.
  • Use a suitable lacquer/enamel or. impregnation to block the resin.

SOLUTION

  • Sand the surface down to the base/substrate.
  • Re-apply the lacquer according to the recommendations.

For more information, do not hesitate to contact us.

FOGGING

REASONS

  • The lacquer is aired too slowly compared to the drying, which causes air bubbles to remain trapped in the film.
  • The humidity in the air and lacquer room is too high.
  • The final lacquer is applied too quickly.
  • The base lacquer has not completely wet the pores (to the bottom).
  • The wood’s accessory components do not accept the lacquer (common with PE lacquers).

PREVENTION

  • Use an anti-foaming agent and/or slower thinner.
  • Control the humidity, lower as required, and use a thinner adapted for such conditions.
  • Dry the bottom coat (primer) sufficiently before applying the next coat of lacquer.
  • Use a base lacquer with good wetting ability.
  • Use special insulation on problematic species of wood (especially exotic species such as teak, rosewood, etc.).
  • Apply a layer of PU lacquer/insulation before applying the PE lacquer.

SOLUTION

  • Sand the surface down to the base/substrate.
  • Re-apply the lacquer according to the recommendations.

For more information, do not hesitate to contact us.

LIFTING/WRINKLING

REASONS

  • Too much material in one coat.
  • The final lacquer is applied too quickly, the base coat is not properly dry.
  • Unsuitable combination of the base and the final lacquer.
  • Inadequate thinner was used.

PREVENTION

  • Check the viscosity and control the application.
  • Ensure that each coat is sufficiently dried before applying the next.
  • Use compatible materials.
  • Use recommended thinners.

SOLUTION

  • Sand the surface down to the base/substrate.
  • Re-apply the lacquer according to the recommendations.

For more information, do not hesitate to contact us.

UNEVEN GLOSS/COLOUR SHADE

REASONS

  • Uneven spraying of the lacquer.
  • The amount of old mix added to the new lacquer is too large.
  • The base is damaged or the primer is over-sanded.
  • The lacquer is poorly mixed in the bucket.
  • The substrate temperature is too high (due to overheating), the lacquer temperature is too low during application.

PREVENTION

  • Check the equipment and settings.
  • Check the viscosity of the old material and add a new (fresh) lacquer mix.
  • Remove any faults (putty) on time and apply another coat of primer.
  • Ensure a proper mixing method – mixer.
  • Adjust the temperature of the substrate and lacquer.

SOLUTION

  • Sand the surface down to the base/substrate.
  • Re-apply the lacquer according to the recommendations.

For more information, do not hesitate to contact us.

CRATERS

REASONS

  • The surface is contaminated with wax, grease, silicone (gloves, hand cream).
  • Compressed air contaminated with condensate or oil residue.
  • Use of silicone polishing agents or sprays in the vicinity of the spray booth.

PREVENTION

  • Check the filters, clean the compressed air inlet pipe system.
  • Remove silicone polishing agents and use non-silicone agents.

SOLUTION

  • Sand the surface down to the base/substrate.
  • Before lacquering, clean the surface with an anti-silicone thinner.

For more information, do not hesitate to contact us.

BAD ADHESION

REASONS

  • The substrate is unclean (dirt, dust, grease).
  • Natural resins and waxes in the wood (pine, exotic wood, etc.), melamine film.
  • The base lacquer coat is too thick and the base surface is over-sanded (overly fine sanding).
  • Insufficient sanding of the base/interlayer sanding.
  • Mismatch between the base and the final lacquer.
  • Droplets of the lacquer are too dry when they fall on the workpiece.
  • Too much time has elapsed between the sanding and the lacquering.

PREVENTION

  • Clean and degrease the surface.
  • Use the recommended insulation, sand the foil before applying the lacquer.
  • Smaller application of the lacquer, lower spray pressure.
  • Check the sandpaper quality (wear and tear).
  • With machine sanding, keep an eye on the pressure and temperature to prevent overheating of the sanded lacquer coat.
  • Use compatible materials.
  • Use a slow thinner, check the distance between the workpiece and the spray gun, increase the flow of the lacquer.
  • Repeat the sanding and dust removal.

SOLUTION

  • Sand the surface down to the base/substrate.
  • Degrease and re-apply the lacquer according to the recommendations.

For more information, do not hesitate to contact us.

PINHOLING

REASONS

  • The lacquer’s viscosity is too high and the substance is dry.
  • Incorrect choice of thinner or insufficient amount.
  • Incorrect pressure when lacquering or incorrect distance from the surface.
  • High air speed and high temperature in the drying room.
  • The wood is too porous.

PREVENTION

  • Check the suitability of the lacquer and lower its viscosity.
  • Use the recommended thinner in the correct amount.
  • Set the spray gun and follow the instructions.
  • Adjust the temperature and air circulation settings.
  • Apply insulation or a thinner lacquer layer with the first application.

SOLUTION

  • Sand the surface down to the base/substrate.
  • Re-apply the lacquer according to the recommendations

For more information, do not hesitate to contact us.

SAGGING

REASONS

  • Unsuitable viscosity of the material, the thickness of the applied material is too small or too large.
  • The distance between the spray gun and the element is too small, incorrect spraying angle, the pressure is too high.
  • Unsuitable spray nozzle size.
  • The temperature of the lacquer, substrate or lacquer room is too low.

PREVENTION

  • Follow the instructions for preparing the application material.
  • Spray in several thin layers with intermediate venting.
  • Check the settings of the spraying equipment.
  • Control and use the recommended nozzles.
  • Temper (heat) the substrates, material and space.

SOLUTION

  • Sand the surface down to the base/substrate.
  • Re-apply the lacquer according to the recommendations.

For more information, do not hesitate to contact us.