Just with every exterior, every interior is different. A normal process of painting an interior starts with masking off the house. Masking off may include the floors, furniture, lights, and covering anything in the house that will not be painted, also removing wallpaper, speckling and repairing any holes in the walls, tacking off switch plates, etc. We may also clean, sand and prime the surface of doors, door casings, baseboards etc. Applying the paint is done by spraying, rolling and brushing. For the doors and door trim just spraying gives you that smooth non-brush mark look.