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by aurizon 132 days ago
I used to work for Schenectady Chemicals in 1968 we developed solderable self fluxing polyurethane coated enamelled wire, it was an immediate hit and soldered well. Times have changed and I left them in 1978, but it might be an item to look for as I found it very handy.
1 comments

Possibly vaguely similar product from a German manufacturer: https://www.sh-wire.de/en/applications/product-range/shsoldr...
Yes, urethane decomposes liberating longer chain organic acids which fluxes