Hard, no. Messy, yes. I followed the instructions under Techniques and Ideas but as I don't have liquid dye simply melted some dye chips in a small pot. My challenge is to spoon the "mashed potato" mixture into the mould without dribbling it all down the side, all over the table, etc, etc. And yes, Donita, I did give the moulds a good bang - very therapeutic. LOL. Thanks for your kind words everyone.