After sponging off you can see how the thin set works. It stays in the shallow depressions left by pitting or small cracks, but doesn't feather or overlap. It is smoother, lighter, almost like a fluffy cake frosting, unlike the M120 which was much more gritty. When it dries (like on the west wall) it has a more clay-like texture, less brittle than the M120. I think that will, in the end, serve us much better. I can see why this is so expensive, especially if it works. When I mentioned to Sue last Friday that we planned on annual repairs, and that if the material failed over the winter we could fix it then, she replied by saying that if we use the right material and use it properly, we shouldn't have to repair these repairs! They're designed to last years. So, wish us luck as we fumble our way through this learning process!