Isopropyl alcohol is the same alcohol used in fuel additives to remove moisture from your tank and to prevent fuel line freeze up. It sort of dries(replaces) the moisture out of the shiners and also keeps them flexible but not mushy. I am not sure the pink anti-freeze would actually preserve shiners and it will get slushy in the freezer. I guess the only way to find out would be to try it and find out for yourselves.