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It always helps when using copper wire to anneal it. Heat to red heat and plunge into water. Most of the oxide will come off during annealing and the rest is easy to remove with a Scotchbrite pot scrubber. Annealed wire can be straightened by using a steel ruler and rolling the wire on your cutting mat.
A lot of craft wire like beading wire has a plastic coating which is nearly impossible to paint or glue.
If you need a little more stiffness than copper wire offers you can use florist's wire - this is a soft iron wire (sometimes coated). It does need painting or varnishing since being Iron, it rusts.
Regards,
Charlie
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