Originally Posted by rossdee
When I take it out of the refrigerator it sweats.
The shape retains fine. It gets hard too. That is the flowers keep the shape. But has dewy effect when taken out of the fridge.
OK, that's not "melting".
It's just condensation forming because you've put a cold cake into a warmer, more humid area. It's a natural, common physical reaction that always occurs and is the same reason a glass of iced tea sweats on a warm summer day.
The humidity condenses into water droplets on the cold surface. Because the surface of the paste is sugar, it creates sugar syrup. If left alone to dry over time or with the aid of a fan, it should be fine.
It has nothing to do with the paste that you're using and no changes to the paste will stop it.
To minimize the issue, you can box the cake before putting it in the fridge and then leave it boxed on the counter until it comes to room temp. The box will "dampen" due to the condensation, but the condensation will no longer sit on the cake surface.