You need to start the finish with the basement.

DIY foundation finish: Stages

You need to start the finish with the basement. But for this it needs to be prepared for the upcoming process. It is necessary to close all the cracks and recesses, and you also need to bring down uneven lumps. The working surface must be cleaned. After cleaning, it is necessary to soak the surface of the foundation with a primulsion. This must be done in order to warn the foundation against a large amount of moisture delay, which will come from a solution or adhesive composition.