The larger the abrasive particles, the coarser the sandpaper. Sandpaper grit is divided into different categories based on the size of the abrasive particles. Sandpaper grit represents the size rating of abrasive materials that sandpaper is made of. To choose the correct sandpaper grit, you need to start by understanding what grit is and its impact on your project. Understanding the differences between them and identifying the right one for your material and project is essential to obtain the desired results. When selecting a new sheet or disc of sandpaper for your project, you will find out that there are several different grits and abrasive materials to choose from. However, picking the correct grit of sandpaper can genuinely make a difference in how smooth and appealing your surface will be – learn more about choosing the right sandpaper grit below. If you are not a DIY expert, all sandpaper types might look similar to you. You will ideally start with a coarser abrasive and use progressively finer ones to achieve a smooth result. Sandpaper grits are categorized by how coarse the abrasive material is. However, when buying sandpaper for the job, it is crucial to understand how different grits can impact the overall result. With sandpaper, you can make your paintwork look great and give your project an extra luxury finish. An abrasive that is waterproof will last you longer with end results you’re aiming for in a wet/dry process.Sandpaper is an essential tool that any DIYer and homeowner should have in their toolbox. If you are looking to conduct a wet or dry sanding, the sandpaper coating must be waterproof.

For example, (based on the figure above) the red Mirka Royal 40 grit disc would be ranked as the most durable, next the Mirka Bulldog 120 grit Gold, followed by the gray Mirka Bulldog 400 grit Gold . Sandpaper Weight Grade: One may see grade letters ranging from A-E which represents the durability of the sandpaper, where E is the strongest. A high grit number is equivalent to how small the grains are which will allow you to smooth the surface. Sandpaper with a grit number in the 200’s and higher would be great for finishes such as buffing, polishing or the removal of small scratches. Sandpaper Grit Sizing: If you are looking to remove a previous material such as gelcoat begin sanding your surface with a 150 grit or lower. A low grit number determines the coarseness of the sandpaper which will give you the ability to remove materials and coatings. This will help when deciding which one is best for the project at hand. When buying your sandpaper, check the item to confirm it states the pressure sensitive adhesive (PSA) or the grit and size number.

Thus, we must make note that sandpaper is measured by its grit size while others are measured by both the grit and grade of the backing.

Reason being is due to the different sizing, backing and grit of the sandpaper. But, how can we identify what type of sandpaper is best? Subjected to the work needed for your project, grit size will come into play. When a project calls for sanding, one must confirm the correct materials are being used.

Sandpaper grit chart