I'll get the concrete question out of the way first. Yes. Adding a liter of ES1 for each yard of concrete when it is being mixed will make the concrete "underwater grade" as you call it. So a 10 yard truck load would get 10 liters put into the mix.

Leverage is a good thing , but you are right , most boycotts fail to get any results without some good leverage applied. The timing on the leverage was key in this case, it put him between a rock and a hard a place with no time to make adjustments.
For the record I have been know run a bluff on the poker table and show it when it worked. When you can't get a call you sometimes have to get them questioning does he have it or is he bluffing.
I'll give up a few chips early to set the table up ....
Thanks for dropping by and I 'll have more on the concrete soon once we have the written report.