When you have a woodworking project, you at some point will need sandpaper. And you will need the proper sandpaper for your project. You need to select not only the right paper but the right grit. If you are using the wrong paper, you could cause damage to your project.
The paper is graded by the number of the abrasive particles it has per inch. When the number is low that means the grit is the most coarse.
Then you have your grades, of sand paper. They are commercial and industrial. The difference in the two are what materials are used for the grit.
Next you have your abrasives. There are five types of sand papers in this category.
So make sure to choose your sand paper wisely.