I spray it with Testors Dullcoat. I especially do this with the chromed
plastic that is supposed to represent cast aluminum.
For older cast iron I use another method- prime with Krylon primer, the
grey stuff. Then I dry brush on some Testors "Steel". Just a little,
to give it the slightest metallic sheen.
Why wouldn't it work on metal? It's simply a goopy coating that you
texture by stippling with a nylon paint brush, like the cheap ones
sold by Testors. It doesn't affect the underlying surface. It's a
thickened, lacquer-based paint, so it should adhere fine, but you
could always apply a metal primer first, if you want.
Beware of actual lead alloys, though, because they can react
chemically over time, producing so-called "lead disease," a corrosion
that eats through paint and eventually destroys the part. Many museums
ban white metal parts on display models because the alloys often
contain lead, and are unstable over time. Good white metal alloys used
for high quality miniatures are a cocktail of zinc, tin, bismuth and
antimony, but contain no lead. Likewise, modern pewter contains no
lead, but some antique period pieces do, as it was cheap.
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