Look Ma, No Leaks...
Well, I don't have any pictures of the leakage that followed, but somewhere along the wooden counterscarp wall, there was an inadequete seal. I came back in the room to find a pool of the precious liquid dripping out from the very front edge of the tile.
So after some strategic clamping and a HazMat crew, I think I've got it solved for now. But, I'm keeping a close eye on it.
So, lesson learned:
1. Pour real water into your planned water feature if there is any possibility of a leak.
Otherwise I have high hopes for it. As a note, make sure your item will be in a well ventilated but dust free environment for the drying. The odor isn't unpleasent, it reminds me of Future Floor Polish (Klear for you UK folks), but initially it did get a bit strong.
Also, it seems I will need a second bottle to get the depth I wanted. (especially after Operation Leaky)
Learn from my mistakes....