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Oh no, don't use that. The most common are #5 and #95. #95 is tinning and way worse. Both of those have a "severe burns" warning on the label.
Not sure which you use, but NEVER use plumming flux on electronics. They are corrosive and conductive. They leave residue that becomes more conductive (and corrosive) with exposure to humid air. If you use that on SMD parts, may as well toss it afterwards! That stuff has killed countles projects of mine before I learned that lesson.
OK rant complete. Get a tub of no-clean MG Chemicals 8341. It's cheap and effective.
Edit: ok, rant not complete. When you flip that radio over to solder stuff, that flux will flow through the holes and run down the legs of the VR's and get under parts. Trust me, ditch the oatley.
Ok now you got me concerned. But to be honest this little tube of flux is at least 25 years old if not older. it's like a quarter of the size of a toothpaste tube so can't image it would last very long for any amount of plumbing work. The writing is worn off it so I can't even read it. I got it from my dads shop after he passed and as far as I know he only worked on electronics and never knew him to do any plumbing. Never used it in any amount anyway stuck a resistor/transistor/cap lead in the tube hole and tinned the wire with solder. Nothing I used it on in the past 15 to 20 years has corroded that I am aware of. But it will find the trash and I will invest in something I know is made for electronics. Thanks for the warning/heads up. I did try to search and see if they ever made flux for electronics 20 + years ago but didn't come up with much. I see they did make solder for electronics..
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