Just for peace of mind , give everything a cleaning . 99% of the time things really don't need it , it's usually my greasy fingers leaving marks on the plastic / resin . Note to self , wash hands before handling kits
. But it's that other 1% that will make your hobby time miserable . I've had a Zvezda kit ( back in the 80s ) that you could actually see the release agent on it , I had to soak in for about a week to get it clean , and have a resin turret kit that the paint kept peeling off like chunks of orange peel , finally spayed it down with bleach bathroom cleaner , and it needed 3 coats of primer as well . Extremes , but life is so much simpler if it's clean to start with . With resin it depends also on how the 2 parts were mixed . Having done my own resin casting , depending on how exact I am , the parts can be hard as rock or flexible like Airfix plastics , those ones hit the trash because paint won't stick
