2023 Author: Philip Bishop | [email protected]. Last modified: 2023-08-25 07:54
- Tips for choosing tools, abrasives and attachments
- Wall grinding technology
- Once again about abrasive material
- How to control the quality of grinding?
The puttying process, no matter how well it is performed, does not allow obtaining a perfectly flat surface. Traces of a spatula remain on the wall, transitions between layers, small irregularities, tubercles and depressions are visible.
You cannot do without surface sanding. Sanding is the final process that prepares the surface for final finishing.
Anyone who has the desire, patience and perseverance can perform sanding after putty. The main thing is to choose the right tool, consumables and accessories, to know the technology for performing the work.
Sanding is carried out dry or wet. Wet sanding is advisable on gypsum plasterboard, plastered walls. The main advantage of wet grinding is the relative cleanliness of the process. You will not be bothered by dust, which is always present during dry sanding. The subsequent cleaning process is forgiven.
Dry sanding is more commonly used in home renovations.
Sanding after puttying is done not earlier than 24 hours after applying the putty layer.
Tips for choosing tools, abrasives and attachments
Without the right tool and fixtures, it will not be possible to perform high-quality grinding of the walls after putty.
You must have:
- sandpaper and sanding mesh;
sanding sponge with angled edges for sanding in hard-to-reach places.
Immediately, we note that the sanding mesh is not clogged with dust during operation, but it costs a little more than sandpaper.
You will need to purchase a sanding block or mandrel to secure the sandpaper or sanding mesh. This device is correctly called a hand skinner.
Sanding paper has different grit sizes and this is important for sanding walls and ceilings for painting. Numbers 20 through 220 indicate the coarse grain structure of the material, numbers 250–2500 correspond to fine-grained sandpaper.
Of the accessories, you will definitely need a stepladder, a lamp or a spotlight, a wide spatula. A wide table or trestle is also suitable, if their height allows you to work on the ceiling.
To ensure safety when performing sanding work, be sure to buy safety glasses, a mask or respirator, a cap, beret or scarf.
Let's move on to the very process of grinding the surface after puttying.
Sanding of walls and ceilings after putty is carried out in a well-lit, well-ventilated area on an absolutely dry surface.
Wall grinding technology
In the first step, use a spatula to go over the entire wall surface. Remove bumps, all kinds of protrusions, nodules. If you find large depressions or pits, putty them, do not try to remove by sanding.
Start sanding only on a completely dry surface.
Rule 4 You
should install quality lighting on one side at an angle to the surface. Its position must not be changed during the entire grinding cycle.
The second stage involves processing the surface with coarse sandpaper or a sanding mesh. The consumable is attached to a sanding block.
Surface grinding is carried out from top to bottom, processing small areas with rotary movements. The plot size should not exceed 1 × 1 m.
It is better to grind from top to bottom in strips no wider than 1 m. Hand movements during grinding are performed in a circle, but you can also move up and down or left and right.
Do not press hard on the tool and sand in one place for a long time. You can wipe off the entire layer of putty.
After sanding the entire surface with a coarse abrasive, continue sanding with fine sandpaper. When using finer emery material, be sure to bring the light source as close to the wall as possible.
Finish sanding with less sweeping strokes and less pressure on the tool.
Hard-to-reach places are sanded with sanding sponges or the old-fashioned method, folded in several layers with sandpaper.
Never work corners or hard-to-reach places with a skin trowel. You will only spoil the surface.
Select the correct grain size for the consumable. A properly selected emery should not leave deep scratches on the plaster.
If the abrasive material leaves scratches, choose a finer sandpaper. Minor scratches are allowed under the wallpaper on the sanded surface after putty. But for painting, the surface of the walls must be absolutely flat. Read how to prepare a wall for painting.
The grinding process is laborious and requires a lot of effort to complete. It can be mechanized using a special grinder. Grinding machines are available that provide for the connection of a vacuum cleaner, which makes the grinding process almost dust-free.
Don't use a belt sander. They are good for working with wood. An eccentric or orbital sander will do.
Although the use of a grinding machine speeds up the grinding process, it is very difficult for a novice builder to get a high-quality sanded surface without special skills.
It is necessary to feel the tool not only to move it correctly, but also to regulate the pressure of the tool on the ground plane. And such a tool is quite expensive.
After sanding, remove the dust layer, do a damp mop and check the surface quality. A layer of primer must be applied before finishing.
Advice 1 It is
better for a novice builder to use hand-held grinders
Sanding the ceiling is no different from sanding the walls. The process is more time consuming and requires patience and accuracy.
Once again about abrasive material
The sanding mesh is more convenient than sandpaper because it does not become clogged with debris and dust during operation. But the right sandpaper also gives good results and is significantly cheaper. When sanding the walls after plastering with your own hands, it is best to use sandpaper numbers 120 … 180 (coarse-grained), and finish grinding with abrasive numbers 220-280 (fine-grained).
Grind the first layer of putty using a coarse abrasive with a grain size of 120-180. For the second layer of finishing putty, use an abrasive with a lower grain size No. 220-280.
Sandpaper and mesh are marked the same way on the back of the material.
How to control the quality of grinding?
At the beginning of the article, it was indicated that the grinding process should be performed with good lighting, constantly directed from one place. Correctly adjusted lighting allows you to constantly monitor the grinding process and its quality by glare on the surface or in the light, applying an even ruler, a building level. There should be no gaps between the control tool and the wall.
When it comes to the ceiling and it is being prepared for painting, the ceiling needs to be sanded better. Illuminate the grinding area with light, this will allow you to see surface defects. Visible scratches are putty and cleaned after drying.
Sanding work ends with a thorough cleaning of the surface and the room and applying a primer to the dry and sanded surface.
In addition, we recommend watching a video on sanding walls and ceilings. Good luck with this dusty business!
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