3M 99421 Pro-Pak Wetordry Silicon Carbide Sandpaper. 320 Grit. 25-Count

3M? Pro-Pak? Tri-M-ite? Wetordry? Silicon Carbide Sandpapers use to sand between coats of paint. varnish or other finish. Flexible A weight backing for contour sanding wet or dry. Can be used with water to reduce clogging and extend abrasive life. Features silicon carbide. a sharp. synthetic material that cuts fast and smooth. Packages are tri-lingual and die cut for convenience.

• 25 Count
• Size: 9 x 11
• Grit: Extra Fine 320
• Abrasive Backing Weight: A Weight
• Abrasive Mineral Type: Silicon Carbide
• Converted Form: Sheet
• For use between coats on paint and varnish
• Packages are tri-lingual and die cut for convenience

Silicon Carbide
Silicon carbide is a very hard mineral characterized by sharp points that fracture easily. resulting in freshly exposed sharp edges that cut extra fast and produce a smooth. professional-looking finish. Silicon carbide products are commonly used for low-pressure applications such as paint prep and finishing on wood and metal. While the mineral has a shorter life than aluminum oxide. it produces a superior finish.

Wetordry?
3M? Wetordry? products are backed with a 3M? patented durable waterproof paper backing that supports both wet and dry applications. Lighter weight than cloth and smooth rather than textured. paper backing is preferable for lighter applications such as finishing and paint prep. At the same time. many such applications produce a significant amount of dust. clogging the abrasive points and creating an inferior work environment. These effects can be minimized by sanding with water to rinse dust away from the workpiece and the abrasive surface.