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Published on Feb 6, 2011
A "youtuber" friend gave me a tip on how to darken nasty modern zinc plated nuts and bolts. These can look out of place on old machines, particularly the trolleys which I mount my vintage stationary engines on.
You need: -a blow torch -a can of engine oil (needs to be thick, so no "3 in 1" "WD40" and so on) -Something to hold the nut and bolt with, plyers grips or studding as in this case (studing is idel as where ever you hold the nut with plyers, the oil will not coat it.) -Rag -A bucket of water too cool things in
Heat the nut in the flame of the blow torch for a minuit or two, until it changes to a white shade.
Dip in the oil (beware of it spitting) and hold it there for a few seconds. I then dip the nut or bolt in water to cool it.
Wipe the "burnt" parts off to leave a smooth metalic grey finish.