I like the Berkley Powerbait Crawfish scent. You can't put that in the plastic when you heat it. It just makes the plastic go bad. I did buy some CCM Toad Xplode and make my baits with that. Then when I put them in a plastic zip lock instead of worm oil I sprayer the Powerbait scent in the bag. It seems to give the bait a little more depth. Not to sure this is what you wanted but it works for me.