Before repainting a wall or varnishing a wood, it is mandatory to go through the "sanding" step, a job which consists in giving a better flatness to the surface so that the finish adheres better. To do this, there are two methods that allow you to have a perfect result. Either you do it by hand or you use a machine or sander. Depending on the material you are going to sand, manual labor may be more beneficial than the machine, and vice versa.
The different types of electric sanders
Machine sanding is a quick and convenient solution. It also allows you to work on larger surfaces and even high surfaces, hence everything the benefit of using the best giraffe sander. However, this device may not be suitable for all other sanding work. Indeed, there are many sanders and you have to know how to choose the right one.
The orbital sander is used to finish sanding and prepare the surface for application of the finish. It is recommended for your solid wood floors, for example, because sanding is only light. In the case of stripping, it is recommended that you sand with a belt sander.
For your walls and ceilings, the giraffe sander is the best solution. Its design allows you to work on heights.
Regarding the eccentric sander, it is the ideal machine for working on contours or curved or curved surfaces. Polishing of wood can also be done with this machine.
As for the angle grinder, as its name suggests, it is designed to work with angles.
Also, for small areas, you can use your hands to better work the surface. The sanding block is mandatory so as not to scratch or injure yourself.
Are the results the same, by hand or by machine?
In reality, whether you are working by hand or with an electric sander, it all depends on the grain you choose. The more you sand with coarse-grained paper, the deeper you attack the surface. The smaller the grain, the lighter and smoother the sanding will be. All sanding papers have a number that defines the grain size. It ranges from 24 to 1200, 24 being the coarsest grain and 1200 the finest grain. An alphabetic character is also present on abrasive papers and defines the thickness of the paper. It goes from A to F, F being the thickest and A the thinnest.
Which grain to choose according to the surface?
When sanding a wall or ceiling, it is recommended to use a grit of between 80 and 180. As far as you are going apply paint, the surface should not be deep sanded.
To sand your woodwork, choose a grain between 180 and 600 to lightly polish the surface to accommodate the varnish.
To completely strip a surface, it is clear that you have to start with a grain of 24 and decrease to 60 to have a less sanded surface.