![]() ![]() The CAMI scale is very similar to the FEPA scale, especially in the more commonly used sandpaper grades and grits such as 60-300. They use numbers only and are not preceded by a letter. In the US sandpaper grit is governed by the CAMI (Coated Abrasive Manufacturers Institute). The scale is based on the diameter of the average particle size in microns. This is represented on the back of a sheet of sandpaper with the letter P e.g. ![]() Sandpaper grit in the UK and Europe is graded by FEPA (Federation of European Producers of Abrasives). It's often used on rough timber that needs to be smoothed out and the first sanding when sanding floorboards. It is used for jobs that have a lot of paint or varnish to remove. This sits below coarse sandpaper and includes 24 and 36 grit sandpaper. It can also be used to smooth out a top coat and fine wet sanding. Grits above 320 such as 400 to 600 are typically used to get a really fine finish on wood ready for waxing or polishing. Higher grit sandpaper such as 320 grit will provide an even smoother finish between coats. The common choice amongst DIYers is 240 grit, which is used between coats to smooth the previous layer of paint ready for the next to help ensure a smooth finish. 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. It is also used on bare wood to smooth out ready for the first coat of paint or varnish. Once the body filler is smooth, step up to 320 grit to remove the 180 grit scratches and create a final featheredge transition. ![]() After shaping, use 180 grit sandpaper to remove the 80 grit scratches, smooth the surface, and to create a gradual transition between the filler and the rest of the panel. It gets rid of any minor imperfections and roughs up the surface to provide good adhesion for a new coat of paint. Use 80 grit sandpaper to shape body fillers. Painting projects often use 120-180 grit for sanding down previously painted surfaces. This ranges from120 to 220 grit and is one of the most commonly used grades in home DIY projects. It is also a good choice on windows, doors, skirting boards that have a lot of layers of paint, especially poorly-applied paint. It's often the first option on old bare wood such as doors and door frames that needs to be smoothed out ready for painting. This ranges from 60-100 grit is and is typically used on bare wood finishes that have coarse cuts and need the quick removal of splinters etc. ![]()
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