My mate The Shooman says to always put conditioner on new shoes as they have often been sitting a long time without a drink.
I always condition the heel inside and out and especially on the top edges to avoid the dreaded topline seam rub. Sometimes its worth conditioning the inside of the toe cap seam
Good advice I reckon. First thing I do with new shoes, condition them up a couple of times.
Never thought of conditioning the inside of a shoe.