Making Rivers for 6mm, Part 2.5

Last night, while working a bit on my little forest hexes, I noticed that some of my river hexes seemed to be even more warped then before (Yikes!!).  It was more noticeable with the double-hexes. I wonder if moisture getting into the exposed foam is responsible. The problem with that theory is that its winter and our house is pretty dry, which my sinuses can testify.

I keep bending them the opposite way, which does crack the foam. Fortunately, the cracks are not noticeable.  Now I wonder what the effect of painting them will be. Stay tuned.