Boiled icing sets up quickly and is almost impossible to spread after cooling. It's worth trying. Dry fondant is similar to powdered sugar. It is easy to use, because all you add is hot water. Scaling is quick and simple with dry fondant.
Wet fondant is extremely thick.
It sometimes takes an effort just to dig it out of its container. Scaling is difficult and messy because the fondant is sticky and only small amounts can be dug out to be weighed. Your scale and hands usually must be washed after using wet fondant. I.When making fondant icings for cake, brownies and eclairs use dry fondant when possible and follow the bags directions concerning the amount of water added and mixing time. After the fondant is wet add the rest of the ingredients.