If you choose to go with coarse-grit sandpaper, you’ll leave lots of marks on the surface, which will mean re-sanding to achieve a smooth finish. However, the joint compounds in use today are generally lightweight and soft, which means that using heavy-grit sandpaper on the surface is the wrong approach (source: RCA Contractors). When working on drywall mud, you may feel like speeding up the sanding procedure by using coarse sandpaper such as 80-grit or lower.
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Tip: You should read my article first on how to mud uneven drywall, before you sand it. Which Grit Sandpaper Should I use for Drywall Mud? (Joint Compound) Look for pre-cut sheets designed to fit your drywall sander to save some time. So, when you’re looking for sandpaper to use for your drywall project, look for 120-150-grit aluminum-oxide sandpaper. They’ll also tear more easily compared to aluminum oxide because they have a thinner substrate. Garnet sandpapers are also open-coat, but they don’t last as long as aluminum oxide papers. The open-coat nature of the material also ensures it won’t clog easily as you work. This type of sandpaper lasts longer because they wear away more slowly compared to the others.
Garnet sandpaper (usually tarnish brown).Aluminum-oxide sandpaper (usually gray).When looking for sandpaper in a typical hardware store, there are three types of commercial-grade papers you can expect to find. In many cases, you won’t have any need to go beyond the 150-grit barrier. The key is to progress until you get your desired smoothness. While 120-150-grit is the recommended range, some projects may require you to go up to 200-220-grit sandpaper in the final finish. Depending on the scope of the project, using the 150-grit may be optional. The 150-grit sandpaper is best used for the final finish of the drywall. It is durable enough to remove any elevations or imperfections-or reduce it significantly where possible. The 120-grit sandpaper is coarse enough for rough sanding in most drywall projects. This is why 120 and 150-grit sandpapers are the recommended ones to use. On the other hand, sandpaper grits higher than 220 are not useful on drywall because the extremely fine abrasives don’t leave much of a dent and clog up quickly. Additionally, using the compound also translates to more sanding to smoothen out the surface. Of course, you can use joint compound to cover up the gouges, but that’s extra work. They may allow you to work quickly, but they are coarse enough to leave deep gouges in the wall that will remain visible after you’ve painted the wall.
For drywall, it’s best to avoid sandpaper grits that are lower than 100 (source: SF Gate). Higher grit numbers translate to finer abrasive action.
The grit rating on sandpaper shows the fineness of the abrasive action. What Sandpaper Grit Should I Use on Drywall? In the rest of this article, you’ll learn more about the sandpaper grit to use on drywall, and the best type of sandpaper to buy, and more. The 150-grit paper is useful for final sanding to ensure the best level of smoothness. The 120-grit sandpaper is fine enough to work on the surface without leaving gouges but coarse enough to sand out imperfections quicker.
The right sandpaper grit for drywall is usually between 120 and 150-grit. One of the things you need to do is choose the right grit sandpaper for the job. It is not a complicated procedure, but you have to painstakingly work to avoid ruining the wall or increasing your workload even further. One of the most important stages of installing or repairing drywall is the sanding stage.
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