3M Company 99420NA 400 Grit Sandpaper 9x11 in 25 Count

Product Description

The 3M COMPANY 99420NA is a silicon carbide wet or dry sanding sheet designed for fine finishing work on paint and varnish surfaces. Each sheet measures 9 inches by 11 inches and is cut to 400 grit, making it well-suited for smooth finish sanding, light material removal, and surface preparation between coats. The flexible A-weight paper backing conforms to contoured surfaces, allowing consistent grit contact on curved or irregular profiles. This pack contains 25 sheets and is sold in a package of 10 packs per unit of measure. These sheets can be used wet or dry depending on application requirements.

These sanding sheets are used in finishing and surface prep applications involving paint, varnish, lacquer, and similar coatings. The 400 grit rating places them in the fine abrasive range, appropriate for final-stage sanding before topcoat application or for scuff-sanding between finish coats. They are commonly used by finishing tradespeople, painters, body shop technicians, and woodworking professionals. The flexible backing makes them practical for hand sanding curved trim, molding, and other contoured surfaces where rigid abrasives lose contact.

Key Features

• 400 grit silicon carbide abrasive for fine finish sanding on paint and varnish
• Flexible A-weight backing conforms to contoured and curved surfaces
• Suitable for both wet and dry sanding applications
• Sheet size of 9 inches by 11 inches for versatile hand or block sanding use
• 25 sheets per box, packaged for easy dispensing and jobsite use

Compatibility

Designed as a general-purpose fine abrasive sanding sheet for use on painted surfaces, varnished wood, and similar finish coatings in both wet and dry sanding applications.

Installation Notes

These abrasive sheets are a consumable finishing supply and do not require tool installation. When sanding between finish coats, ensure the previous coat is fully cured before abrading. For wet sanding, use appropriate water or lubricant and avoid saturating surrounding materials. Dispose of used sheets per local waste guidelines.

Technical Specifications

• Grit: 400
• Abrasive Material: Silicon Carbide
• Sheet Size: 9 inches x 11 inches
• Backing Type: Flexible A-Weight Paper
• Use Type: Wet or Dry
• Sheet Count per Box: 25
• Package Quantity: 10 packs
• Unit of Measure: PK
• Weight: 9.5 pounds

Standard Information

• Brand: 3M COMPANY
• Manufacturer Part Number: 99420NA