Orientation of effect pigments in painting systems
Effect coatings display their colour shade by appropriate formulation and by the manner of the application.
Especially bright, strongly iridescent or flip-flop paints are extremely dependent on the painting method, as you can see in the following video film:
Wet application means high material output with insufficient spraying airflow and pressure at too low painting speed.
The spraying of the lacquer and the distribution of the aluminium pigments in the lacquer are non-satisfactory. The balance of building up viscosity to the film shrinkage is unfavourable.
Ideal application: The correct ratio of paint atomizing air combined with the speed rate of application guarantees an consistent distribution of the aluminium pigments on the painted substrate. The even formation of the film by evaporation of the solvents provides an ideal orientation of the pigments. The balance of building up viscosity to the film shrinkage is optimal.
Dry application means insufficient amount of lacquer applicated at a too high atomized air, airflow and speed. The aluminium pigments are already "frozen" in the paint matrix due to the missing fluent capacity of the varnish
The pigments cannot sufficiently align or orient themselves parallel to the surface. Some of the pigments even stick out of the surface. The surface is noticeably rough and uneven.
An ideal finish guarantees a perfect effect. The appearance, the light-dark effect (flop effect) is noticeable from different viewing angles.
ECKART: Effect pigments for brilliant shining paint results...