Sandpaper grit chart for cars3/28/2024 ![]() ![]() Sanding Swirls in the wood from incorrect grit sequence or poor sanding technique. This will lead to over-sanding and swirls in the wood. Therefore, each abrasive must be able to remove the scratch from the previous grit, so, for example, if a P180 follows a P80, the P180 will not totally remove the scratch. If the valley of the scratch is invaded, the wood will close, causing pooling and a blotchy finish. The goal is, throughout your grit sequence, to even out the peaks and valleys so that the surface will become smoother, without “invading” the valley. When you use a coarse grit, you are creating a deeper scratch with higher peaks. When you are sanding, you are applying a sharp cutting tool to your surface and creating scratches made up of peaks and valleys – known as RA and RZ. Why You Should Follow The Golden Rule Of Sanding The only way to be sure is to test it out in your specific situation. We can, however, make no guarantees for products from other manufacturers. This sequence cuts out P100, P150 and P220.Ĭaveat: This rule can generally be applied with higher quality abrasives, and we have seen it hold true with our own products. The golden rule for choosing your sequence is to never skip more than 1 grit.įor example, if you start with P80, and need to finish at P240, rather than using every grit from P80 – P220, you can do P80 – P120 – P180 – P240. So, what to do if you need to rough sand all the way on through to the finer grits for finishing? If you don’t need to sand at every stage, you can limit what grits you need… but, even if you do need to sand course through fine, as long as you stick to the golden rule of sanding, you still can get by without keeping every grit available in the shop. For instance, if you’re only ever going to do rough sanding, vs if you plan on only using stain finish, or if you need to refinish cabinets or sand lacquer or other shiny finishes, will all influence what grits you should have on hand. What grits you’ll need, and in what format of product (belt, disc, sheet, etc.) will depend greatly on your sanding application. You might be wondering, “does that mean I need to stock all the grits, from 24-2500 at all times?” This is much more easily explained in the following graphic: Depending on the material, we offer products from P24 all the way to 10,000. P100), where coarser, or larger grains, have a lower number and finer, or smaller grains, have a higher number. There are different systems out there, and typically, Uneeda’s products follow the FEPA standard, in which grit is denoted by the letter P and then a number (e.g. With the sieve number, grain size is determined by the number of meshes per inch, whereas with micro grains, the size is determined by the sinking speed during sedimentation. ![]() The sizes are standardized and determined by two main methods: sieve number or micro grain. ![]() Coatings.)Ĭoated abrasives, such as sanding belts, discs or sheets, come with a variety of standard grain sizes, more commonly known as grit, or grit size. (You can learn more about these other elements in the linked articles. Sandpaper, or coated abrasives, as the broader category is known, are composed of abrasive grains, adhesive and a substrate backing. ![]()
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