Finally worked with this stuff for the first time. Not quite as expanding as the original stuff, but still expands pretty good. Very slick with rocks on the glass, so the first row was extremely difficult to hold in place;
After that, the remaining rows were not too bad . . .
As you can tell from the pictures, it is difficult to keep it exactly where you want it.
We sprinkled a layer of black sand over the drying foam once we had completed the final set;