also, you said some things that make it seem like you think the naptha is supposed to evaporate in the freezer. the naptha should be sealed air tight to prevent any condensation getting inside of it. also, make sure you leave it in the freezer for a long enough time, and when you pour the naptha out of the container you can also turn the container upside down to get the naptha to drip off of the crystals. what swim does is uses pint jars for his freeze precip, laying them on their side in the freezer, and when ready, pours all the naptha in another empty jar, takes the jars with the crystals, lay them at an angle to get the naptha to drip off, and place a fan on them to dry them immediately, to prevent much from redisolving.