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The best commercial screens have a perfectly smooth surface with no texture or surface imperfections completed by optical coatings to improve image quality. It is physically impossible for the home hobbyist to replicate the level of smoothness of a quality screen with paint. To whatever extent a painted surface shows texture, orange peel or imperfections there will be a corresponding loss of image detail. A painted wall is an inexpensive solution but not a substitute for a quality screen. If you are on a budget it is tempting to take a shortcut but the projector and a screen form a system that together renders your image and the result is only as good as the weakest link. A painted wall is a weak link.