Possibly a daft question but I see a lot of products advertised as "textured paint" but it never goes into detail as to what the texture looks like/what the finished result will be. I've got a room where 3 of the walls will be sand/cemend rendered and the other wall is smooth, but I want it to look the same as the rendered walls.. So if I had a smooth skimmed wall and I wanted it looking like painted sand/cement render, would I use a textured paint, or would I use an ordinary paint with sand mixed in?