RUPES HQ400 film abrasives feature a durable polyester film backing with multiple dust‑extraction holes to prevent clogging and keep the cutting surface working efficiently. The precision‑coated aluminium oxide grain delivers a consistent, controlled cut and a smooth finish, even on edges and contours. The flexible film backing resists tearing and works well for both dry and wet sanding. Choose the appropriate grit to level texture, remove runs and orange peel, or refine scratch patterns before polishing.