I have only used the Dow blue foam. I have not had the moisture problems that you spoke of. I am in Washington and its always moist!
I buy the sheets of 1/2" and I have had no trouble with warping. As far as I can tell the blue and pink are the same except color? I am going to pick up some of the elmers rubber cement and try it. I am working on a plan for a Sukhoi SU26M. Thanks for the tip on the glue, I have tried many,many types without much success.