My advise is don't. I ordered a small can of Renaissance wax and applied it very softly with a clean and soft lintless cloth on two Kallitype prints that I had dry mounted on museum board. A small amount of the sentizer/toner came off on the cloth leaving two small but unsightly "smudges" in the otherwise dark sheen of a running stream of one print necessitating a reprinting of the negative. Although a tiny amount came off on the second print it is not discernable in the print. There is a slight increase in the dmax but not enough alone to warrant the risk. I applied the wax shortly after dry mounting the print so it is possible, I imagine, that the molecules were in a state of flux from the heat although I waited until the board had cooled down. I did test it on a much older throw-away print before applying it to the mounted prints and although a small amount of chemistry was deposited in the cloth no degradation of the print was noticed. The paper was Hahn Rag.
Thomas
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