50g Solder Flux Paste, Electrical Solder Flux Tin Paste, No-Clean Solder Grease Professional Mechanic Welding Repair Tool for Phone SMD PCB BGA PGA (Lead Free)

I have been soldering for years and use a lot of solder with flux built in, but using a separate flux gives you that extra bond you just don't get with soldering alone. How many times have you tried to solder a wire to something like a battery and the solder just ends up balling up and floating on top of the metal surface. Put a tiny bit of flux on it first and the solder just sticks solidly to the battery with no effort at all, giving you good solder joints. A good quality product that lasts a while.

Helps solder flow and adhere

I’ve got this grease to fix up a friends old fan and it’s running good as new for a year now. It is grease so it can be hard to wash off things so wear gloves. I think it’s pretty good for its price.

Works well and we had no issues

This is the best flux I have used to date. Not sure what’s in it but it has improved the flow of my soldering. It’s pretty solid in the tub, so you need encourage it flow with the hot iron tip to transfer to your wire or component.

Is good

Excellent

Especially if your using unleaded solderHelps with flow