Yep. It's dry filler. The first fill you really need to almost overfill a carto to make sure it is completely wetted.
Leave the silicone cap on the connector end about half way. Put mucho
juice in. At least 20-25 drops. Let the drops run down the inside of the carto on to the filler slowly so that it doesn't get into the center hole. About 4 drops at a time. Let it soak in.
Stand it upright for 25-30 minutes or until you see
juice drop into the end cap. Add juice until it does.
Remove the end cap, blow out the carto gently from both ends into a tissue or small piece (2 inch square) of paper towel.
Dab the connector end with the tissue until there is no more loose juice. Or blow it out some more from the connector end and soak up the excess from the other end with the tissue/paper towel.
Attach it to the battery and give a few primer puffs without inhaling.
Well, that's my method for a new Boge cartomizer. Hope it works for you.