Thick cyno makes an ideal small gap filler,just put a seam of the cyno into the joint and sprinkle bicarbonate of soda onto the adhesive,it will immediately set like rock,this is not to be used as an excuse for bad joints but just a cosmetic clean up mostly for small models.
You should always aim to get the best possible structural joint in any structure.
You should always aim to get the best possible structural joint in any structure.