Propeller blades should be polished if the surface roughness has been increased visibly strongly respective fouling has been observed.
Special polishing soft disks used by hydraulic units for Propeller Polishing up to grade A’ *
Equipment used for polishing the surface without loss of Propeller material, otherwise if normal abrasive disk used the blade thickness will reduced.
( * grade A depends the propeller condition )
Propeller Blade is like “mirror” of polishing machine ! ! !