Doesn't harden
As with other Dr Oetker icing pens it just doesn't set - even in the fridge. You can't pack up cookies or cakes with this icing pen on it as it will just smudge everywhere and make it look terrible. It's a shame as otherwise it looks quite nice!
Not fit for purpose sadly
Very disappointing, even following the tips and hints others suggested it was unusable. Too gloopy and more like a separated gel no matter how much you mixed it, it didnt spread with a fine brush, knife or using the noozle.