Applying Metallic Powders
Spraying metallic powder coatings comes with its own issues. There are many potential issues which will affect the quality of the finish therefore seek advice where necessary. Potential variables include (but are not limited to):
Ensure the equipment you are using is suited to metallic application. Tribo/airstatic equipment will produce a different effect than electrostatic application equipment. Know your equipment.
Automated and hand guns - Metallics are better sprayed using automatic guns, using hand guns for smaller parts only.
Tribo/airstatic guns - Ensure the powder coating is suitable for Tribo/airstatic guns. A different effect can be realized due to differences in the way particles accept the charge.
Guns should be cleaned regularly. The appearance of the coating can vary depending on the type of gun used. Deflector nozzles can cause issues with increased sintering.
Electrical short cutting in the gun can occur, but can be prevented by using an exterior charging gun tip.
Ensure the seal between the gun and tip is sealed properly – especially when using equipment with interchangeable tips.
Metallic coatings spray best at lower range KV settings. Consult the technical data sheet and our technician if you are not sure.
Ensure the gun is a constant distance from the part to achieve a consistent metallic effect.
Some effects need to be cured using the exact schedule provided as even slight differences in temperature can cause discoloration of the metallic flake.
Sufficient grounding is an essential requirement to spraying metallic powder coatings.
For more trouble shooting information check out the Polychem A-Z guide or contact firstname.lastname@example.org