Sofia Martinez
Sandpaper is an essential tool for achieving a smooth finish on wooden or other surfaces. It is graded based on the size of its grit, which determines its coarseness and appropriate uses. When sanding, it is crucial to start with a rough grit to remove imperfections and finish with a finer grit to smooth out scratches. The specific grit sequence depends on the desired finish and the material being sanded, such as wood or plastic. For example, a popular grit progression for wood is 80, 120, 150, 180, and 220 grit, while grits above 600 are recommended for plastics. Additionally, different types of sandpaper, such as garnet or silicon carbide, are suited for specific applications like hand-sanding or power sanding.
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What You'll Learn
Sanding grit depends on the material
Sandpaper is graded based on the size of its grit, and the grade you need depends on the job at hand. Grit measures the coarseness of sandpaper, which is determined by the size of the abrasive particles on its surface. A coarse grit wears down the material more quickly, but it also leaves deeper scratches.
For sanding plastic, grits above the 600 range are recommended. Fine to ultra-fine grits from 600 to 1,200 are most useful when polishing metal.
For sanding wood, the type of wood you are finishing has a direct relationship with the grit used for final sanding. For example, you will get about the same surface on oak with 150 grit as on pine at 220 grit. If you want to stain the wood, sanding too far won't allow the stain to penetrate the wood. For hardwoods, it is recommended to stop at 150/180 grit for stain. For no stain and a hardening oil finish, you can go up to 220.
When sanding wood, you typically won't start any lower than 80 grit. A popular grit progression for wood is 80 grit followed by 120 grit, 150 grit, 180 grit, and 220 grit. For heavy sanding and stripping, you need coarse sandpaper measuring 40 to 60 grit; for smoothing surfaces and removing small imperfections, choose 80 to 120 grit sandpaper.
Garnet sandpaper is best for wood hand-sanding. It produces the smoothest surface but wears out the fastest. Emery sandpaper, on the other hand, is too sharp for sanding wood and is best for removing corrosion, polishing steel, deburring, and paint removal.
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Coarse grits wear down surfaces faster
Coarse grits are ideal for wearing down surfaces faster. They are used for heavy sanding and stripping and are measured as 40- to 60-grit sandpaper. Coarse grits are perfect for removing paint and varnish from wood surfaces, and for sanding old floors. They can also be used to roughly shape wood and remove previous finishes, such as light coats of polyurethane.
Coarse grits are also used to remove large imperfections from a surface. They are often the first choice when preparing wood for finishing. Coarse grits are perfect for hand sanding or with a belt or orbital sander. They are also effective for removing rust and corrosion from metal.
Coarser grits are known by smaller numbers than finer grits. For example, a small number like 20 or 40 indicates a coarse grit, while a large number like 1500 indicates a fine grit. The size of the grit is roughly equal to 2/3 inch divided by the "grit size" number. For instance, "100" grit sandpaper has a particle size of 0.160 mm.
Coarse grit sandpaper wears down quickly and requires more frequent replacement. Garnet sandpaper, for example, wears out the fastest but produces the smoothest surface. It is the best sandpaper for wood hand-sanding. Flint sandpaper, on the other hand, is economical but less durable and is better suited for rough work on small projects.
When working with coarse grit sandpaper, it is important to wear protective gear, including eyewear and a respirator mask, to safeguard against the dust generated during sanding.
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Fine grits are for sanding finishes
Fine grit sandpaper is used to create a smooth, polished finish. It is often used to sand wood before applying a finish, or to polish metal. Fine grit sandpaper can also be used to remove minor scratches from a surface. It is available on 9- x 11-inch paper or cardboard sheets, or on precut backings for machines like detail or random orbital sanders.
Fine grit sandpaper is also good for sanding drywall. When you just need some for hand-sanding, or to use with an orbital sander, this is the grade you’ll most likely use. Fine grit sandpaper is typically used after a medium grit sandpaper, which can leave a coarse surface texture.
Very-fine grit sandpaper (150-, 180- and 220-grit) produces ultra-smooth surfaces on wood. It is often used to scuff-sand lacquer, polyurethane and other finishes before applying another coat.
Extra-fine grit sandpaper (320- and 360-grit) is the first of the micro-abrasives. It is primarily used for sanding finishes before polishing.
Some people believe that sanding to a high grit can prevent finishes from penetrating the wood. However, this is not necessarily true. While it is important to be aware of the grading system being used, as there is a big difference between the old USA standard (CAMI) and the European standard (FEPA) above 220, most people will not be able to see the difference beyond 400 grit.
Fine grit sandpaper is an important tool for sanding finishes and creating a smooth, polished surface. It is available in a variety of grades and can be used on a range of materials, making it a versatile tool for any home improvement project.
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Medium grits are good for removing rust
Sandpaper is an essential tool for smoothing and shaping wood, removing old finishes, and polishing new ones. It is also used to remove corrosion from metal pipes and smooth plastic pipes before gluing them. When choosing sandpaper, it is important to consider the grit size, which refers to the coarseness of the sandpaper determined by the size of the abrasive particles on its surface. Lower grit numbers indicate a coarser sandpaper that can scrape deeper and remove material more quickly, while higher numbers indicate a finer grit that is better for delicate applications and creating a smooth finish.
Medium grit sandpaper, typically ranging from 60 to 80 grit, is ideal for removing rust and corrosion from metal surfaces. It can effectively eliminate rust while minimizing the risk of damaging the underlying material. This grit size is often used for hand sanding or with power tools like belt or orbital sanders. While it may not be suitable for antiques or furniture due to the potential for light scratches, it is a versatile option for removing rust from items like pipes or metal appliances.
When removing rust with medium grit sandpaper, it is important to start with a coarse grit to efficiently remove the majority of the rust and then switch to a finer grit to smooth the surface and remove any remaining rust. This process, known as "'going through the grits," ensures a thorough rust removal and a smooth final finish. It is also crucial to wear protective gear, such as eyewear and a respirator mask, when working with sandpaper to safeguard against dust and debris.
The type of job and the condition of the rusted metal will determine the specific grit size within the medium range that should be used. For heavy machinery or items where aesthetics are not a priority, a lower grit size, such as 40 to 50 grit, can be effective in quickly removing rust while accepting the possibility of light scratches. On the other hand, for more sensitive metal surfaces like furniture or decor, a higher grit size within the medium range, such as 100 to 150 grit, is recommended to balance rust removal and scratch prevention.
Medium grit sandpaper is a versatile option for removing rust from metal surfaces. By selecting the appropriate grit size within the medium range and following the proper sanding techniques, one can effectively eliminate rust while preserving the underlying material. Remember to exercise patience during the rust removal process and always prioritize safety by using the appropriate protective gear.
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Sand with the grain of the wood
Sanding with the grain of the wood is important for achieving a smooth and uniform finish. The grain of the wood refers to the direction in which the wood fibres run, and it is important to sand in this direction to avoid leaving visible marks or scratches on the surface.
When sanding with the grain, the sandpaper moves in the same direction as the wood fibres, creating a smooth and even finish. Sanding against the grain can leave scratches that are more difficult to remove and may require additional sanding to achieve a desirable result. By sanding with the grain, you can also avoid clogging the surface pores of the wood, which is important for maintaining the wood's natural beauty and ensuring a consistent finish.
It is worth noting that the direction of the grain can vary within a single piece of wood. For example, the grain may run horizontally in one section and then change direction, running vertically or at an angle. As a result, it is important to pay attention to the grain pattern and adjust your sanding direction accordingly as you work on different areas of the wood.
While it is generally recommended to sand with the grain, there may be times when it is challenging or impossible to do so, especially when working with intricate or curved pieces of wood. In these cases, using a random-orbit sander can be a solution as it sands in all directions simultaneously, reducing the risk of visible scratches. However, for the final sanding pass, it is advisable to sand by hand with the grain to eliminate any remaining cross-grain scratches and ensure a smooth finish.
Additionally, the choice of sandpaper grit is crucial when sanding with the grain. Coarser grits, such as 60-grit, will leave larger scratches, while finer grits, like 150-grit or higher, are better for creating ultra-smooth surfaces. Starting with a coarser grit for initial sanding and gradually progressing to finer grits will help achieve a uniform finish that follows the grain of the wood.
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Frequently asked questions
Sandpaper grit is what makes sandpaper abrasive. Manufacturers grade sandpaper based on the size of the grit, with lower numbers denoting coarser grits and finer ones having higher numbers.
Sandpaper with a grit above 600 is recommended for plastics.
The grit of sandpaper used for sanding wood depends on the type of wood and the desired finish. For softer woods, a grit of 220 is recommended. For harder woods, a grit of 150 is recommended. For sanding wood with a stain, a grit of 150-180 is recommended. For wood with a hardening oil finish, a grit of 220 can be used. For wood with a clear oil finish, a grit of 400 is recommended. For removing scratches and planing marks, a medium grit of 60-80 is recommended. For smoothing surfaces, a grit of 80-120 is recommended.
For sanding the first coat of finish or paint, use a grit of 180-220 for oil-based and water-based finishes and a grit of 220 for paint.
Garnet sandpaper is suitable for sanding plastic and wood. It is a soft grit that wears out the fastest but produces the smoothest surface.
