I moved to Hawaii 7 years ago from Southern California where it is dry & such low humidity I don’t even think it counts! Fortunately we live on Kauai which has the least humidity of all the islands (in my opinion) but the first year here was during the time it rained practically non stop for 40 days!!!! It was just plain WET that year & I nearly gave up cake decorating for good….however I experimented & asked advice from all around the world & now I can happily say that I am not having problems. I use mostly Satin Ice fondant with 2 or more teaspoons of Tylose & 1 teaspoon of Cream of Tartar kneaded into the fondant. Of course I always tell everyone not to eat the decorations as they will taste sour from the Cream of Tartar. I also mix 1/2 teaspoon Tylose into my fondant for covering cakes & making decorations that go directly on to the cake & will be eaten. Hope this helps a little.