The coarser the salt, the less it affects transparency. I use Kosher salt in my clear baits, but I'm a Jewish carpenter! Hahaha
Seriously, I have used the Caney Creek HD sinking stuff, and it makes baits stronger and more flexible, but I lose transparency with it. For darker, more solid colors, like green pumpkin Ikas and senkos, it's great, and makes them last longer. But I still add salt for additional weight, and because I like how the fish will hold it longer with salt in the bait.