>      2) Does anyone know suppliers of corrosive water-soluble acid fluxes?

We use Kester 1189.  Great stuff.  Here's their phone number:
847-297-1600
They should be more than happy to send you a sample (which may be
enough to fulfill the requirements of the job in question?)

Regards!
Lainie Loveless
General Atronics Corp
Wyndmoor, PA
(215) 242-7336

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