You can get regular worm oil from most all of the suppliers.
If you want to make sure U do not damage UR plastic I would suggest that route.
It is generaly used to help in packing ... I apply a little to the bag and then slide
in the baits .... For scents I add to the Worm oil (Oil of Anise is hard to beat)
DO NOT USE MINERAL OIL .... and there are a few other oils that will destroy ur baits.

Hope that helps a little
JSC