Another thought- we had a small splice, which means it took a lot of resin to fill the mold, and we still had a bit left over. Had we wrapped the splice in electrical tape, as suggested, instead of heat shrink, you could build it up a little and not need as much resin to fill the mold. If you had more molds, you could do multiple pours at once. It is feasible to separate the resin into smaller batches, mix as needed, and reuse the mold. may want to put a little silicone spray on the mold to make it easier to remove and not damage it.