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If you've got Copper wire try annealing it - heat to red hot and plunge into water. Quick scrub with a pot scrub to get rid of any loose oxide - this seems to roughen the surface and gives a good key for acrylic paint. I did the spokes on my Lebedenko tank that way and the paint is still adhering well.
Not sure about steel wire - perhaps etch with an acid.
regards,
Charlie
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