My last post here was 5 years ago. Unfortunately I abandoned my hobby for a while due to lack of time and space. I am very glad to see that the forum is still here (Hey Antdude!) and my old profile seems to be working fine.
I decided to start again and build a small vertical plaster formicarium but would like to avoid a problem that happened a lot to me in the past: my plaster nests deteriorating very fast due to humidity. I live in Brazil and all expressions like plaster, "plaster of paris" or gypsum translate to the same material on Portuguese: "gesso". If I go to any store here and ask for it I will get the same white dust that will deteriorate very fast.
I am very impressed because I saw some reports about plaster nests that exists for more than 2 years. Definitely it can't be the exact same material I was using.
Doing some research I read about a kind of plaster used by dentists for their models. It's literal translation to English is something like "rock plaster" (gesso-pedra) and it seems it is more robust than the "white common one".
My first question is, does anyone here used this "dental plaster"? Can tell something about it?
Second question: maybe I am just looking for the wrong material. Is there any Portuguese speaker who could help me with the material naming?
I am glad to see you again and thanks in advance!