The zinc probably will make it a bit more gray. The diesel will make it slippery and smelly as Brian suggests.
You should seriously look into using the Japan colors I linked that will stain it any color or shade you like. Other gray stains will do the same thing but you can have more control over the nuances with Japan colors.
"The cure for anything is salt water~ sweat, tears, or the sea." ~Isak Denesen
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