Johnson quit making that stuff years ago. I still have a little left that I use for my tools.
Minwax sells various colors and I find it "ok", but costlier than the Johnsons use to be.
The turtle wax may have silicones which can mess with a finish, but for a jig the silicone should not cause issues.
You can also use the clear packing tape, wax paper, etc if the jig shape allows.