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I am working up the courage to start at caulk mat myself. I have all the ingredients I just need to find the time (and courage) to get started. So it is good to see when people do this and everyone seems to get brilliant results for their efforts.
I made one a while back using caulk, PVA and sand on fleece material. It got a bit 'wavy' in storage but went flat after 48 hours so I tarted it up with some flock for use in my FFoL games:
Splendid stuff Jeff, it looks great so far. I can testify to how nice Dr De'Ath's mat is too.
You knew where the iron was? That's turned out very nice. The hint of grass under the snow does give it the feel of depth that you mentioned. Good stuff mate.
The only advantage I think to using boards is the fact that you can sculpt terrain onto a board, you won't be able to do that with a Mat I don't think.