I had a similar issue on the “Toilet Paper Roll” cake I made. I used Satin Ice. I usually don’t have problems with it. The humidity was very high here, 94%. My cake sweated terribly. I also had a bubble come up, top dead center, on the front of the cake. It was 2 inches across. This time, the sweat worked for me. It kept the fondant from drying out so I could work the blister flat.
I will be watching this discussion. I also want to know how to keep the fondant cakes from settling after they have been covered with fondant.
Psalm 127:1 Unless the LORD builds the house, the builders labor in vain.