Dusting
Dusting turns up in 3 fields: thermal spray, powder coating, concrete. Here is what it means to the people in each one.
Dusting in thermal spray
Fine, cooled overspray that settles on a surface as loose powder and weakens the next layer sprayed over it.
Light coating of particles that solidified or cooled before reaching the surface, settling on previously sprayed areas, around the edge of the spray pattern or on surfaces waiting to be coated. It bonds poorly, so material sprayed over it can delaminate between layers. Gun paths that run off the part, extraction airflow and sequencing are arranged to keep dusting off areas still to be coated.
"There's dusting on the back side of the ring from the first side, blow it off and sweep before you flip it."
Dusting in powder coating
A light, quick pass of powder that barely covers, or the first thin pass before building film.
Sprayers dust a part to lay down a thin first layer, check coverage or mist a hard-to-reach area before building film. A dusting that goes into the oven alone cures thin and see-through. The word also describes powder drifting onto masked areas or neighboring parts.
"Just give the back side a dusting, the front's where the customer looks."
Dusting in concrete
A soft, powdery concrete surface that rubs off under traffic or a scraped fingernail.
The top of a dusting floor is weak because it was finished with bleed water on it, dusted with dry cement, poorly cured, frozen early, or carbonated by exhaust from unvented heaters in a cold-weather enclosure. It sheds fine powder under foot and forklift traffic and keeps doing so. Light cases are fixed with silicate densifiers; bad ones need grinding or a topping.
"Whole back room is dusting, and the floor guys say the heaters in that tent were never vented."