So far I have ceiling paint covered foam rocks in the river. I want a fast flowing river. I will glue some rounded rocks on the river bed.
![Image](http://i295.photobucket.com/albums/mm127/mikeruby_photos/NFS/NFS%20Lifting%20board/NFSliftingboardscenery33_zpsca4127ec.jpg)
Has anyone used the various products available?
How well did they work?
Are there any known reactions with other media such as PVA or matt media?
Should I build the bridges first, or put them in after the water?
Any other suggestions?