How much sandpaper should I use to polish the rust on the metal surface and the wall?

Use 800 mesh sandpaper to polish the rust on the metal surface.

The wall is sanded with 280 mesh water sandpaper for the first time, and then used 360 mesh for final treatment. The sandpaper is too coarse, which can easily lead to scratches, and the choice of wall sandpaper is not the thicker the better, but it is advisable to match the wall putty.

The common number of sandpaper meshes (the number of sand grains per inch) in wall sanding is . Among them, it can be classified as coarse sandpaper as medium, and above 320 as fine sandpaper.

The size of the mesh determines the size of the mesh aperture. The size of the mesh pore size determines the maximum particle dmax of the sieved powder. Therefore, it can be seen that it is entirely possible that the 400 mesh polishing powder is very fine, such as only 1 2 microns, or it is entirely possible that it is 10 microns or 20 microns.

This is because the pore size of the screen is about 38 microns.

It is best to use 800, you can't use coarse if you make up for it, if it's too coarse, the sandpaper print is more likely to be bad, if the wall is leveled with putty powder, you can use 303, and then brush it with latex paint.

1. The wall treatment and polishing should be carried out with 280 and 360 sandpaper respectively, and the effect is better, and it is not easy to produce lines.

2. Under normal circumstances, the wall treatment should be scraped 1 times of plaster, 2 times of putty, and polished separately before applying latex paint.

3. After spraying the primer, it should be polished with 600 fine sandpaper to remove the flow and pomelo peel phenomenon caused by spraying the primer, and then the paint is more perfect.

80 grit sandpaper.

The number and mesh of commonly used sandpaper.

It is consistent, that is, the larger the mark of the sandpaper, the more mesh, the finer the sandpaper, the smaller the mark, the less mesh, the finer the sandpaper. Generally, the sandpaper label is 30 gauge, and the fineness is 30 mesh. The label is 60, and the fineness is 60 mesh.

The label is 400 and the fineness is 400 mesh.

Precautions for the use of sandpaper.

It should be noted that when choosing different types of sandpaper, the polishing direction should be changed at a suitable angle. This makes it possible to distinguish the effect of the striped shadows left after polishing with different sandpapers on the front and back.

Before changing to a different type of sandpaper, it is best to carefully wipe the polished surface with a cleaning solution such as 100% cotton dipped in alcohol, because often a small amount of grit left on the surface will ruin the whole polishing work that follows. The polishing process is very particular about the overall cleanliness of the surface, and it is important to pay attention to this when changing different sandpapers.

The above content refers to Encyclopedia - Sandpaper.

The best 800 one is to make up, can not use coarse, too coarse sandpaper printing is more likely to be bad, if the wall is leveled with putty powder, you can use 303, and then brush on latex paint on it, I am doing decoration, I hope mine can help you.

Answer: Iron sandpaper is used to polish the rust on the surface of the metal, generally using the zero number.

To polish the wall, you need to use water sandpaper, generally 180 or 240.

This is what I asked an acquaintance of the painter for 30 years, you can buy it in the material store, and you can also buy a professional sandpaper tool in that store, the sandpaper can be clamped on the tool at both ends, and it is easy to hurt your hands when grinding by hand.

Also buy a paint brush, brush it after grinding, and see if it is polished!

Detailed tools and **I post below.

Water sandpaper. <>

Water sandpaper on the back.

Sandpaper tool.

Sandpaper tool.

Painter's brush.