First of all, there are some spots. Immediately after painting everything looks fine, and after drying, spots appear on the ceiling. Further work with a roller only worsens the result, the surface becomes more and more heterogeneous. Spots on the ceiling, which seemed to be just shades of different lighting, really become very prominent spots.
Let's look at the nature of these spots. Stains on the ceiling are not bad mixing of paints of different colors. We have paint of the same color (usually white) and from one bucket. And the same roller. And spots appear.
If you take a closer look at these spots, you can see a different texture of the same surface of our ceiling. The layers of paint have a different texture and thickness, which our eyes immediately catch. Places of uniform texture look the same and do not catch the eye.
Without finding out the cause of this phenomenon, some of the ceiling are repainted again, further increasing the difference in texture and, accordingly, in shades.
So why did the ill-starred spots appear? Yes, from the inability and violation of technology coloring.
Before the start of coloring prepare the necessary.
Material - paint. Water emulsion. Domestic it or import - almost no difference (just not outright fake).
Tool - roller. Influences the quality of painting the ceiling to a greater extent. Of all the variety of rollers, the best result is achieved when working with a roller with a long pile (threads). Foam rubber is not good - it gives bubbles, velor is also not quite suitable - it takes a little paint. The final painting of the ceiling is carried out with the help of a new paint roller with an average pile length.
Now the main thing is coloring technology.
The basis of high-quality painting - drawing on the surface of the ceiling (wall) a uniform paint composition. How to achieve this?
Dilute the paint to the desired thickness in accordance with the instructions. Most often, the manufacturer recommends adding 5−10% of water. If the manufacturer does not recommend diluting the paint, then we only mix it. With paint everything. As a rule, to paint the ceiling in one layer of this mixing is enough.
Now we take a roller and dunk it in a bucket of paint, do not drop it in a bucket completely, namely dunk. The roller gets wet on one side only, and we it is necessary to ensure that the entire roller circumference is evenly filled with paint. To do this, we roll the roller on the grid, bath, or on a clean sheet of linoleum, hardboard, etc. But not on the ceiling! If we start painting the ceiling or walls right away, we will have so-called non-colors, which after drying will give stains. We may need to once again dip the roller in the paint and roll it out again until the entire surface of the roller is evenly filled with paint. As the painting works, this operation is constantly repeated.
Experienced painters do this automatically, but we would like to practice on any surface that you don’t feel sorry for the experiment.
Now the next important point. Uniform paint application ceiling. It is a uniform one, i.e. there should be no gaps! Here we should not delay the process of painting the ceiling. It is advisable to do it quickly. Yes, it is not difficult, even in a large room. 15-20 minutes and the ceiling is ready. As soon as our roller gave all the paint to the ceiling, we again dip it into paint, roll it out and paint the ceiling.
There is one very important point. A person who paints the ceiling does not see the place where he “walked” with a roller once or several times. For him, the surface above it has acquired a uniform wet hue and it seems that everything is dyed the same. Here lies the danger of another blunder. Experienced painters periodically move aside and look at the ceiling from a different angle. You can attract an assistant, who, standing against the opposite wall, will see the painted surface from a different angle and immediately notice the non-colors. It is very important to paint over all non-protraces before they are dry!
As a result of this work, the surface of the ceiling turns out to be smooth, like an egg-shell!
there is some more very important additions to the process of painting the ceiling.
After each coat of paint, the surface of the ceiling should dry. It is better to paint in the afternoon to repeat in the morning. Without letting the first layer dry, we blur and lift the first layer with the second layer, causing only harm.
If, after drying the first layer of paint, we see spots, then in no case do we try to paint them with thick paint. You can apply another layer, more liquid paint, over the entire surface of the ceiling.
It happens that stains remain. Everything, "arrived"! We stop painting (all further painting work is useless and leads only to material over-expenditure). If there are spots that do not suit us, then the work must be redone.
This can be corrected only as follows - to grind the entire ceiling with fine sandpaper on the bar. Only necessarily all, otherwise after re-staining will appear again.
If we do this after the first or second layer, the result will be better than it would be immediately. And if we overlooked and put a lot of layers, then just grinding the ceiling will not help us fix the situation - you have to sand and putty, well, and paint it all over again.
I hope that the knowledge of these very important moments will help you achieve a high quality of work when painting the ceiling. Good luck!