3M Wetordry Sandpaper delivers 400-grit silicon carbide cutting performance for wet or dry sanding of varnish, lacquer, paint, and other finish coats. Silicon carbide abrasive cuts fast and smooth with a sharp synthetic mineral that performs well when used with water or cutting oil to reduce clogging. Available in A-weight flexible backing for contour sanding and C-weight backing for improved stock removal. Each pack includes 5 sheets of 9 x 11 inches for use by hand or with a sanding block. Model: 9085NA. UPC: 051144090853.
What is the difference between wet sanding and dry sanding with Wetordry paper?
Wet sanding uses water or cutting oil as a lubricant, which carries swarf away, prevents loading, and produces a finer, more consistent finish. Dry sanding at 400 grit removes material faster but may leave slightly more visible scratches. For clear coat and lacquer work, wet sanding is preferred.
What grit should I use before and after 400?
Before 400, use 220 or 320 to remove deeper scratches. After 400, move to 600 or 800 for finer finishes on clear coat or lacquer. For automotive clear coat restoration, a progression of 400 to 800 to 1500 to 2000 is common.
Does the A-weight or C-weight backing matter for hand sanding?
A-weight backing is lighter and more flexible, making it better for sanding curved or contoured surfaces by hand. C-weight is stiffer and provides better feedback for leveling flat surfaces. For general hand sanding, A-weight is more comfortable.
Can I use Wetordry sandpaper on wood?
Yes, though Wetordry silicon carbide paper is primarily designed for finishing coats on paint, varnish, and lacquer. On wood it can be used dry for fine finishing, but aluminum oxide paper tends to be preferred for most woodworking applications.
# 3M Wetordry Sandpaper 400 Grit, 9 in x 11 in, 5 Sheets **Model:** `9085NA` **Brand:** 3M **Category:** Sandpaper > 3M Wetordry Sandpaper delivers 400-grit silicon carbide cutting performance for wet or dry sanding of varnish, lacquer, paint, and other finish coats. Silicon carbide abrasive cuts fast and smooth with a sharp synthetic mineral that performs well when used with water or cutting oil to reduce clogging. Available in A-weight flexible backing for contour sanding and C-weight backing for improved stock removal. Each pack includes 5 sheets of 9 x 11 inches for use by hand or with a sanding block. Model: 9085NA. UPC: 051144090853. ## Specifications | Attribute | Value | |---|---| | Product Type | Sandpaper Sheet | | Grit | 400 | | Sheet Size In | 9 x 11 | | Abrasive Type | Silicon carbide | | Backing | Waterproof paper | | Wet Dry | Yes | | Pack Count | 5 | | Barcode (UPC) | 051144090853 | Source: https://www.jaspecs.com/3m/sandpaper/9085na-3m-imperial-wetordry-sandpaper-400-grit/