Brush the wall solid directly can scrape putty

If the concrete wall is in the rough room, and the wall is sanded, it must be wall solid。If there is no sand on the concrete wall, there is no need to paint the wall again。

If the blank house is white walls or old house renovation, generally speaking, as long as the old wall is removed and polished。However, if the old wall has holes, cracks and falls off, it proves that there is a problem with the foundation surface of the old wall。At this time, the wall should be used locally to strengthen the stability of the local wall。