[Heathkit] OT question on soldering flux

[Paul Kraemer]

DeOxit sells a nice not so aggressive paste flux.  Found it at PartsExpress
For a little more aggressive I prefer RubyFluid paste.  Available on Amazon 
and other places.
Does a great job on stubborn things like old transformer leads and doesn't 
eat things like radios
We use "no clean" flux in our wave solder machine and it is primarily IPA 
with a hint of rosin
Paul K0UYA