Fine particle applicator and related methods

A fine particle applicator system, comprising:

• two or more fine particle applicators;
• one or more electrostatic zones;
• and
• one or more exhaust systems;
• wherein the fine particle applicator includes:
• a loading vessel;
• a metering roller, positioned adjacent the loading vessel;
• a first stippling roller, in contact with the metering roller;
• a high speed roller, positioned adjacent the metering roller such that bristles of the metering roller and bristles of the high speed roller overlap at least about 1/32 inches to form an interference zone;
• a second stippling roller, in contact with the high speed roller;
• a stippling shoe, positioned adjacent at least the metering roller and high speed roller;
• a housing;
• and
• wherein at least a portion of a surface of the stippling shoe closest to at least the metering roller and high speed roller includes substantially the same curvature as the roller nearest the surface, and wherein the interactions between the metering roller, the high speed roller, and the stippling rollers allow the applicator to self-clean.