By the way, it is quite easy to become allergic to turpentine. I am, after years of painting.
This happened to my etching teacher. She became sensitized to solvents and had to wear gloves. That's a big handicap when it comes to wiping the plate, which should be done w/ the palm of your hand for the final wipe.
One can learn a lot about archival issues by studying paintings, since they've been around so much longer than photography. Myself, I'd be leery of putting anything, even wax, on the surface of a fiber print. Whatever you put on there will interact w/ air and the paper's surface, eventually sinking into the paper and whatever is behind it. Bees wax sounds like the safest, but it's still going to dry out and eventually crack.
A photograph doesn't have the lifespan of an art print or a painting, both of which should last many hundreds of years if mounted and displayed properly. So given that it's more difficult to make a photograph archival due to it's nature, I'm hesitant to put any kind of coating on a finished print.