I am trying out a new crepe recipe tonight, one that calls for melted butter. It says to add it after the batter has rested for a little bit (10-20 minutes). I'm making the batter now, to cook in a few hours. Do I add the melted butter just before I cook the crepes, or in about 10-20 mins, and put the batter with the butter (lol!) in the fridge for another couple of hours? Does it make a difference which way around I do it?

TIA