I have 12,000 grit that I use to polish scratches out of Acrylic
aquariums. Kits for this are available through Aquarium supply
stores. They have multiple grades of paper and liquids to polish
scratches.
Doug
------------- Original message follows -------------
First, ACG rails had a variety of coatings over the years, Black track was
black oxided, Silver track was zinc or cadmium, and MAYBE nickel. I say
maybe because it is a more expensive plating. Side rods were often
nickeled
in the early years, then zinc and cadmium. Operation of the trains
does wear
away the plating. Yes, sanding does remove plating too. Rust occurs
where
there is no plating, or other protective coating and moisture is present.
Cleaning with sandpaper should be done with the finer grits, 400
grit or
higher (you can easily get up to 2000 grit in an automotive paint
supply
store nowadays--BTW, this fine a grit used to only be available as a
"modeling sandpaper" and cost a lot more!). This is usually in a "wet
or
dry" paper, which does work better, and lasts longer used wet--water
or a
mild solvent (I use water). The "Scratchy pads" are also useful for the
cleaning, and can be used wet too.
When refinishing reclaimed track, I do not sand the finish off the
rail
tops if the track is not going to be used soon.
S'
David D.
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