With the grout laid down and sealed it was time to pour the resin for the Elster. First things first, the ends had to be dammed.
I used 2" by 4" styrene, held in place with masking tape and Lexel multi-purpose sealant.
I added a second layer of masking tape, covering the bottom of the styrene dam after these photos were snapped.
I brushed a thin layer of resin onto the river bottom to pre-seal it before the proper pour. Any sealer would do (grout sealer, Mod Podge, ETC),it insures that the poured resin will not leak through the base.
Once the seal coat was dry I poured all the river sections over the course of two afternoons.
I used Golden High Flow acrylics Sap Green to colour the resin; I should have added more as I would have preferred the river to be a darker but it looked perfect while I was mixing. Next time I will know to make it darker than I prefer as once it is poured the shallow rivers turn out lighter.
The dark spots on the banks are places where the resin either dripped or overflowed slightly before it levelled out. That's no bother as I can put swamp grass tufts in those locations. Out of the 16 dams, 3 leaked a little but the loss of resin did not make a significant difference to height of the river.
My preferred resin for this kind of thing is EcoPoxy Flowcast SPR:
I love this line of products: easy to use, mixes 2:1 by volume, can do pours up to 1" thick, cleans up with isopropyl alcohol (before it is set), and has plenty of working time. The fumes are not intolerable but I keep a window open anyways. 


This is coming together nicely. The colour of the river looks fine to me..
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