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The environtex tends to 'creep'up onto things so be aware and be sure to pour it into the base slowly and carefully.
I was more concerned with the illusion of depth and worried that a pour too thick would end up too heavy
I was at a model railroad structure show
(
http://modelrailroadexpo.com/ ) last Friday and Saturday and got a good tip in a clinic for fighting Envirotex "creep", which I suspect many of the similar products also exhibit. The cause for this is capillary action, and the speaker said you could combat it by painting surfaces with Envirotex before the pour.
Of course, that would be impossible with the reeds that Charles used, and it also requires that you know what your final water effect height is going to be. I just had a thought - you could perhaps use water to test the effectiveness of your seals for the Envirotex, and also use that to mark your "high water line".
I'd suggest mixing a very small batch for just this purpose, and using a small - but disposable - brush. If you do this from your main batch, there's too much of a chance that you'll get distracted and let it harden too much to get a good pour.
Charles also mentioned an "illusion of depth". One way to achieve this is to use coloring agents (green, brown ?) for the bottom layer of ~ 1/8", and then maybe a light blue for a middle layer, and clear for the top one. You could also add things, such as very small fish or "half-floating" plant material, into the middle layer(s) to really create a sense of depth. I've read that it's easy to use too much color, so research on the web first (material and technique)and test in a small area before applying this on your dio.
The last thing is to make sure you have/use a level, as otherwise the Envirotex is going to flow right over the lowest edge of your containment dam.