Steve Merlo, THE hand pouring genius out west here, shakes popcorn salt over the top of his baits after he pours the, but while they're still hot, and says it soaks in enough to create a salty "cloud" around the bait for 20+- minutes. Fish eat his baits, and don't spit them out. Robo has a similar automated system for dusting their worms with salt, and fish eat Robo worms.
Gary Yamamoto said he helped Gene Larew make a lot of money by having to pay for using Gene's salt inclusion idea.
In all my years of fishing, the only baits that fish hold longer than Senkos and Ikas are live baits.
So I add salt to my soft plastics, in varying amounts. A little goes a long way for flavor.
I am going to add some bacon fat to a small batch of plastics. Even if they don't get bit, I can still enjoy coffee and bacon on the boat, since I use coffee for a scent, too.
Seriously, I am a hobby pourer, so I can play around just for fun. If they do get bit, I will keep the baits out of the heat, because I don't want them to turn rancid, and I'll store them in the frig in the warmer weather. It's not a problem now, with temps at 33 at night, and a roaring 55 during the day. Hahaha