3M 431Q Sandpaper 9"x 11" Wetordry Sheets

3M Wetordry 431Q Abrasive Paper is a silicon carbide abrasive sheet designed for fast cutting and consistent finishing in both wet and dry sanding applications. The strong C-weight, waterproof paper backing provides durability and helps reduce loading during use on paint, primer, gel coat, metal, wood, and other suitable substrates.

BAC sells 3M 431Q sheets individually, allowing aircraft maintenance and MRO technicians to order the specific grit and quantity needed without purchasing an entire 50-sheet pack.

3M 431Q Abrasive Sheet Features

Aircraft Maintenance Applications

3M Wetordry 431Q abrasive sheets can be used for a variety of aircraft maintenance, refinishing, and MRO operations where controlled sanding and surface preparation are required. Common applications include:

• Paint and primer preparation: Smooth primer surfaces before applying topcoat and prepare surfaces for subsequent finishing operations.
• Paint repair and blending: Feather the edges of repaired paint areas and prepare surrounding surfaces for seamless blending.
• Paint defect removal: Remove minor surface imperfections, dust nibs, orange peel, and other defects when permitted by the applicable repair procedure.
• Composite repairs: Prepare composite repair areas between filler, primer, and finish coats and refine cured epoxy or other suitable repair materials.
• Metal surface preparation: Lightly abrade suitable aluminum, stainless steel, titanium, and other metal surfaces before applying primers, sealants, or coatings.
• Paint finishing: Wet sand suitable cured coatings and clear coats to remove minor surface imperfections or prepare surfaces for polishing.
• Plastic and transparent materials: Use appropriate fine grits for controlled sanding of suitable acrylic, polycarbonate, and other plastic components during approved refinishing procedures.

Wet or Dry Sanding

The waterproof backing of 3M Wetordry 431Q allows the sheets to be used for both wet and dry sanding applications. Wet sanding can help reduce abrasive loading and provide a controlled cutting action during appropriate finishing operations. Dry sanding provides a convenient option for general surface preparation and repair work.

Choose the sanding method and abrasive grade appropriate for the substrate, coating, repair procedure, and required surface finish. Follow the applicable aircraft maintenance instructions, repair specifications, and material manufacturer's recommendations for the specific application.

3M 431Q Grit Selection

3M Wetordry 431Q is available in seven grit options for different sanding and finishing requirements: 80, 180, 220, 280, 320, 400, and 600 grit. Coarser grits provide more aggressive cutting for initial preparation, while finer grits are used to refine surfaces and reduce sanding scratches before subsequent coating, finishing, or polishing operations.

BAC offers individual 3M 431Q sheets so technicians can select the appropriate abrasive grade and purchase only the quantity needed for a particular job.

Individual 3M 431Q Sheets

3M Wetordry 431Q is packaged by the manufacturer in packs of 50 sheets, but BAC sells the sheets individually. This provides a convenient option for aircraft maintenance departments, repair stations, paint shops, and other MRO operations that need specific abrasive grits without purchasing a full package.