3M Pro-Pak paint and rust removal (alox) can be used for general purpose sanding, garnet for bare woods and silicon carbide for wet or dry sanding of plastics, fiberglass and top coats. 3M Pro-Pak aluminum oxide sandpaper are the abrasives are the choice of professionals for sanding a wide variety of materials and surfaces. This durable sandpaper and outlasts ordinary glue bond paper. Made with aluminum oxide minerals. Life cut of the sandpaper and outlasts ordinary glue bond paper.