If you would like to cover the cake with ready-to-roll fondant icing, dust a work surface with cornflour. Knead a dash of food colouring, if using, into the fondant until evenly coloured.
Roll the light blue fondant out onto a surface dusted with cornflour, to around 5mm thick, or until you have a sheet big enough to cover the cake. Trim off any excess using a sharp knife.
It’s primarily used to mold over a cake or baked good to ... and consistency you want, then rolled out and dusted with more sugar. You can also color fondant by kneading it with a few dollops ...