"Used this to apply Aqua Mix grout colorant/sealer to around 200sqft of tile floor.Overall it worked well and there were very little issues with waste or excess coming out.You will still want to have a toothbrush or paintbrush handy to get the hard to reach places and crevices.Not sure about its longevity, the wheel definitely shows some wear after doing the job but how often do you really need to color/seal your grout?"