The brand we use is called 'Beaphar', seems to be a Dutch company. It does smell pretty bad that's the only down side of it, but for us, it didn't matter because we really needed it's help! I don't know if the paint of the wall is marked, we just sprayed it on our curtains, and nothing to be seen on those. Although, when we needed to use it somewhere else, we sprayed the repellant on a piece of fabric, just incase, so we woulnd't ruin anything. We haven't used it for few months now, and still they remember that curtains are no no!

And one other tip: you don't want to use it on a small room, the smell takes over the room and even you can't stay there...Of ocurse it depends on a product hos strong the smell is. Other smell your cats are supposed to hate is all citron fruits. We've tested it and C & K absolutely HATE orange and lemon, they won't go close!