Hi bgmach
to the Surface Engineering Forum.
What is the equipment/process that you are using and the thickness of coating?
Improving ventilation/air flow around the spray area to remove dust and debris. Try not to use shorter spray distance/stand off than recommended and if anything use lower than recommended powder feed rates, particularly if you are using the high spray rate parameters. Usually, Metco 444 is a pretty tolerant with good thickness limitation/low stress and normally doesn't mind getting a bit hot (certainly more so than other coatings
).