P320 Sandpaper– When sanding between coats of polyurethane, P320 will wipe off any surface inconsistencies left from the finish. Also, wet sanding will generally use 320 as this practice requires a very fine grit as well. The paper has a high resistance to loading and curling, offering a uniform finish across the workpiece. Smirdex Wet and Dry Paper; perfect results This ranges from120 to 220 grit and is one of the most commonly used grades in home DIY projects. Painting projects often use 120-180 grit for sanding down previously painted surfaces. It gets rid of any minor imperfections and roughs up the surface to provide good adhesion for a new coat of paint. It is also used on bare wood to smooth out ready for the first coat of paint or varnish. P80 Sandpaper– This is the starting grit for most hardwoods and is a staple for every wood worker. P80 grit is the best option for removing saw blade burns and deeper surface scratches. In the case that you’re working with a hardwood like Poplar, you can probably jump the line to P120. Medium Sanding Grades

Due to its expert technical knowledge of the technologies and materials available across the industry, Promain has a reputation for outstanding service among its trade and retail customers. It is also the common choice when sanding painted walls, smoothing out plaster and rubbing down filler to blend in with the surface it's on. As you’ve already notices, we opted for the “P” grade system since that is largely what we use in our projects. It’s also the international standard for denoting the coarseness of an abrasive. The Coarser Abrasive Grades

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Very fine sandpaper grit is used for sanding over bare wood. As per FEPA standards, such sandpaper grit is denoted by P150, P180, and P220, while CAMI standards denote them as 150, 180, or 220. The diameter of the particles ranges between 66 to 100 micrometers. Micro Grits This highly coarse sandpaper grit ensures expedited removal of all kinds of material. Because of the roughness, extra coarse sandpaper is used for the initial round of sanding on hardwood flooring. As per the FEPA standards, the sandpaper grit sizing is denoted by P30, P36, P12, and P16, while the CAMI standards denote the classes as 24, 30, or 36. The average diameter of the sandpaper grit particles can range anywhere between 530 to 1815 micrometers. Coarse P220 Sandpaper– For novice woodworkers, it’s time that we tell you that you have to sand with multiple grits. And P220 is generally the go-to 2nd & 3rd level abrasive for prepping wood for oil finishes. But in the case that you’re applying a wood stain, your destination does stop here. Finishing Sandpaper Grits Macro grit sandpapers range across the following sub-types. The one thing they all have in common is that abrasive papers in this family all have fewer grains, but the grains they have are large. Extra Coarse

P180 Sandpaper– If you encounter a raised wood grain fiber, P180 has your solution. Of course, you will have to refinish the wood per the original method. On a separate note, sandpaper grade P180 is a safe option for prepping latex paints. These types of sandpaper grit classes ensure rapid material removal. As per FEPA standards, these are classified as P40 or P50 and are denoted as 40, 50, or 60 by CAMI standards. The typical diameter of the sandpaper grit ranges between 336 to 425 micrometers. This sandpaper allows you to clear away a layer of finish or debris with little effort. However, it may not leave behind the smoothest surface texture. Medium The micro grit types of sandpaper grit are classified as follows and are primarily used for small, precise sanding, like taking off coats of finish or smoothing small areas of buildup.This is used to initiate wood polishing. FEPA standards classify these types of sandpaper grit as P400, P500, or P600 while CAMI classifies them as 360 or 320, and diameter sizes range between 25.8 to 36.0 micrometers. Super Fine Grit Levels P40 & P60– Most projects won’t need these sandpaper grades. They’re only required for cleaning up rough lumber, evening out large bumps in the wood, & removing stubborn old paints. Essentially, you’ll use these to soften anything that’s too rough for your hands to handle. Also, they can remove almost anything so don’t hesitate to jump up to the next grit. Smirdex is a leading company in the field of manufacturing premium quality abrasives for a wide range of applications. With a key focus on high quality standards achieved through the use of top quality raw materials, certified production processes, and the development of innovation via specialised research, Smirdex produce quality products used in a multitude of industries across the globe. At a glance Grits above 320 such as 400 to 600 are typically used to get a really fine finish on wood ready for waxing or polishing. It can also be used to smooth out a top coat and fine wet sanding.

This sits below coarse sandpaper and includes 24 and 36 grit sandpaper. It is used for jobs that have a lot of paint or varnish to remove. It's often used on rough timber that needs to be smoothed out and the first sanding when sanding floorboards. What does the P mean in sandpaper grits? The supreme quality of the micro grits is visible when sanding varnished surfaces, where the quality and roughness of the treated surface has great uniformity. P400 Sandpaper– Only oil finishes like tung oil & teak oil require the surface to be finished to this level. And it’s also not a requirement for all wood working projects that use those types of finishes. Lastly, you can rely on P400 to smooth the top coats of polyurethane. P120 Sandpaper– Any wood that was too soft for P80 will start the latter at P120. We generally use this grit when first smoothing pine, redwood, & cedar. Lastly, enamel paints and polyurethane don’t require the wood to be sanded beyond P120. The only exception would be a clear satin finish, in which case you may want to eliminate any scratches left on the wood with P150 or P180. Despite the identical name to the abrasive paper category listed above, very fine micro grits are distinct and are used for sanding finishes in between consecutive coats on either wood or drywall. FEPA classifications are P240, P280, P320, or P360 while CAMI classifications are denoted as 240. The diameter size is between 40.5 to 58.5 micrometers. Extra Fine

Macro Grits

This kind of grit is used to sand bare wood to prepare it for varnish removal or final finishing. The FEPA standards denote such types of sandpaper grit by P60, or P80, and CAMI standards denote it as 80. The diameter of the particles ranges between 190 to 265 micrometers. Fine PaintWell increased its Industrial Paints offering with the acquisition of Promain UK Limited, the preferred UK distributor for many of the world’s leading paint and surface coatings manufacturers. Super fine micro grade paper is ideal to sand the final layer of finish on wood. It is just strong enough to thin patches and small inconsistencies in the layer's application, but not rough enough to actually remove anything that would want to be kept. FEPA classifies them as P800, P1000, or P1200 while CAMI classifies them as 400, 500, or 600, and average diameter sizes range from 15.3 to 23.0 micrometers. Ultra Fine