How to write slogans on walls

If the wall is white, just use a brush dipped in colored paint to write on it. When writing, be careful not to let the paint flow directly down the brush and onto your hands, or down the wall, which would be unsightly. So don’t put too much paint on the brush each time, and don’t make the paint too thin. If you are not sure that you can write it well in one go, you can use a pencil to trace the outline of the words in advance.

If the wall is not white, just use a brush dipped in lime water to write on it. When I wrote it, it didn't look white or good-looking. After a few hours, the lime water oxidized and it looked good.

If the wall surface is uneven, you need to treat the wall surface with putty and wall paint first.