P60: Heavy removal of old paint, rust, or filler; shaping rough surfaces.
P80: Quick leveling of putty or wood, ideal for initial surface smoothing.
P120: Refining sanded surfaces and preparing for primer or finer grits.
P150: Blending repaired areas and removing sanding marks.
P180: Fine sanding before primer or paint application.
P240: Smoothing coated or primed surfaces for uniform finish.
P320: Pre-polishing stage for edges, curves, and finishing coats.
P400: Final ultra-smooth finish before polishing or top coating.