does anyone know if your wall texture has to be the same throughout the whole house. I took down wallpaper and now I have bare drywall in kitchen and baths. The rest of the house is done in a heavy knock-down texture on the walls. To have someone come in and do it professionally to match the rest of the house is very expensive. Have heard of stuff you roll on or trowel on. Does anyone know if that stuff works? Also, does anyone have any experience with airless paint sprayer to paint inside of house?