I have small ice plastics in a couple bait shops and when I package these I add a drop of worm oil to help facilitate packaging. Lately I have been adding a drop of Cherry Bomb to half of the order's packages and a drop of home brewed anise to the other half after the baits are packaged and if anything the customers nag about oily baits. These are all shot using the soft formula Do-It plastic. On other, larger bodied baits that have tails that like to stick to the bags when I am bagging them I'll add a drop or so of worm oil. Depending on the size of the baits, the oil will get absorbed in time but it is absorbed faster on larger baits in the same time frame as it is in smaller baits. I started adding a few drops of worm oil directly to my plastic as I initially develop the color and cook it. Plastics done in this manner seem to absorb less of the oil while in the packaging.
If you are making larger baits, those with significantly bigger volumes, try adding a half a teaspoon of worm oil to, say, a 8 or 12 ounce batch of plastic or 1/4 tsp. to a 4 or 6 ounce batch. This might help with preventing baits in the packaging from sucking up your oil. You could also try adding some worm oil to your scent product too. Or you could scent them with your choice of product and then add worm oil just prior to shipping.
To help clear things up a little, organic oils will lose a little to evaporation since they will have a tiny bit of moisture in them. Organic oils will emulsify [mix with water] and stay that way for a long time while any petroleum oil that has been emulsified will separate in a short time.. Petroleum oil products, such as which is found in worm oil does not evaporate as we know it and a physical change in the natural viscosity of a petroleum oil will occur only with heat. Petroleum oils might seem to dry out but mostly they are not but the other products in the oil can and will leading you to think its the oil. The oils used in worm oil will not dry out near so fast as it will be absorbed by the plastic if the plastic is short on oil from the start....hence the adding of worm oil when you cook the plastic. Your scent products may contain quite a bit of water or moisture and in a zip lock bag that moisture will find its way past the seal and give your baits a sticky, dry feeling and appearance. If you add 10 drops of scent product to your bag, wait a couple days and add half that many drops or straight worm oil.