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    Home » Sandpaper Grit: What to Know Before You Buy

    Sandpaper Grit: What to Know Before You Buy

    November 26, 2021No Comments Painting
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    Sandpaper Grit Guide
    Grit Purpose
    60-80 Extremely coarse; best for removing large amounts of wood and rounding off corners.
    100-150 Medium grit; good for general purpose sanding.
    180-220 Fine; used to roughen surfaces for painting or as a first passthrough for later sanding with ultra-fine grits.
    320 Ultra-fine; helps achieve a nearly glass-smooth texture.

    What Is Sandpaper Grit?

    Sandpaper grit is sized by a gauge number, with lower numbers signifying larger, coarser grits. For example, #24- or #40-grit sandpaper is a very coarse, rough sandpaper, while the #1,000-grit paper is extremely fine with very small abrasive particles.

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    The grit number of sandpaper is almost always clearly printed on the back of the sandpaper itself. Grit numbers range from #24 all the way up to #1,000 although most people will never use grits at the top or bottom of this scale.

    Fun Fact

    It’s often thought that the grit number refers to the number of grit particles per square inch. Not so. Rather, the number scale refers to the number of holes per square inch in the screens that are used when sieving the abrasive grains during the sandpaper’s manufacture. For example, in 60-grit sandpaper, the abrasive particles used in the paper were sieved through a screen that had 60 holes per square inch.

    How Sandpaper Grit Works

    Coarser, or lower-number grit, sandpaper removes wood and other materials faster and with less effort than finer sandpaper. It does this by cutting the fibers on the material’s surface.

    Aggressive scratching is desired when you want to remove much material or to create a rounded edge, or to remove old paint or blemishes. But the coarse sandpaper also leaves deep scratches.

    At the other end of the spectrum, very fine sandpaper removes a tiny amount of material, with the effect of smoothing the surface. The finer the paper, the smoother the surface. The concern here is that if you switch to a fine paper too soon, you’ll spend a lot of time sanding to get the results you want.

    Also, sanding wood with too-fine paper, or sanding too much, can actually burnish or create a shine to the surface. This produces overworked areas that can hinder the absorption of stains and other finishes. Excessively sanded wood can create a blotchy appearance when stained and finished.

    The trick, then, is to start with the highest grit (coarsest sandpaper) that will meet your needs relatively quickly, then move up to progressively higher grits (smoother papers) as the surface gets closer to the finished product—and to stop when it’s smooth enough for your liking.

    Sandpaper Grit Ranges

    While you can find many differently graded sandpapers available, most sanding projects call for papers in the following grit ranges:

    #60–#80 Grit: Coarse

    Sandpaper grit in these low numbers cuts through old paint and rough edges with ease. It can also take off enough wood to shape and round edges.

    Coarse-grit sandpaper is not recommended for fine details or for edges and corners that you want to keep sharp. Also, be very careful using this on veneer plywood since the thin face layers are easy to sand through.


    The Spruce / Margot Cavin

    #100–#150 Grit: Medium

    The most often-used gauge of sandpaper grit is in the medium range. For most applications, it is hard to go wrong with sandpaper grits in this range. You can work down difficult materials by applying more pressure to your workpiece. Or, you can preserve fine materials by letting up on the pressure. This grit is generally used for bare wood surfaces.

    A final sanding with 150-grit paper is commonly recommended for wood surfaces that will be painted; it leaves a little texture, or tooth, to the wood surface for the paint to grip onto.

    For whatever type of projects you work on, it is always beneficial to have medium-grit sandpaper on hand.


    The Spruce / Margot Cavin

    #180–#220 Grit: Fine

    Seldom used on the first run-through, unless the surface is already smooth to the touch, fine-grit sandpaper in this range is typically for second or third sandings. Sometimes, fine-grit sandpaper is used to roughen glossy paint in preparation for applying another coat. Bare wood that will be stained often should not be sanded with higher than 220-grit paper. Fine or ultra-fine sandpaper grits are used for furniture work.


    The Spruce / Margot Cavin

    #320 Grit: Ultra-Fine

    Ultra-fine sandpaper grit is used to achieve another level of smoothness on all types of materials. With wood, ultra-fine grits usually are reserved for smoothing painted surfaces between coats. Many finer grits are used for wet sanding, which creates a fine, gritty slurry that complements the sandpaper’s efforts at smoothing. #320 grit sandpaper is even used as one of the first grits when sanding down solid surface countertops.


    The Spruce / Margot Cavin

    Source: The Spruce

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