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I have found that if I let my projects rest for a few days after applying anything with a fair amount of moisture in it then seal it both top and bottom very well it really limits the amount of warping if any, I have built terrain using cardboard, glue water and tissue, giving each step a chance to dry really well, then let set for a little while, then cover it with very find sand with water and glue and again let it set, then seal the c**p out of it, and out of all my pieces I had one that warped so little that it wasn't a problem.
That has a nice atmospheric feel to it. Any issues getting terrain to lay flat on the tiles? Do you just build without bases?
What gives it the "melted" look?
The subtle application of flame. 😁