I would like to know too. In the past I have lightly dusted with lustre dust and in places it does not cover and looks as though it is a greasy spot although I have only used potato flour to roll out with. Do you think it may have been airbrushed on?
This look is probably achieved by an airbrush.You can either thin gold lustre dust with vodka or white rum and spray it with an airbrush or use Americolors new Gold sheen liquid that is new and you use it directly from the bottle.
I saw the bottles of gold spray and wondered if it was good - I don't have an airbrush and probably won't be purchasing one before I do the cake!