Classification for abrasive materials used in surface preparation and finishing before painting. Includes sandpaper, abrasive cloth, abrasive film, steel wool, abrasive pads, and compounds that uniformly polish metal, resin, and wood surfaces to improve paint and coating adhesion. Classified by grit size from coarse to fine finishing. Includes abrasive discs for power tools and manual abrasive sheets. Distinguished from cutting tools and grinding wheels, specialized for surface treatment processes.