La-Co22194 -Water Soluble, All Weather Copper Flux Paste for Soldering, Brush in Cap, Developed for Plumbing, 4 oz, Made in USA

This product works well! I've been using non stop since I received it! It cleans up well with water after soldering! I like much better than the previous flux which was greasy to clean up!Love the brush in cap!You can see it working as soon as applying! The copper starts to turn bright!

This flux is great. Not expensive and does the job very well.

This flux works well and makes soldering so much easier.I highly recommend this product! 😄

It works

Estubo bien de mucha alluda

Good price and I didn’t have to run to the store with free delivery

Worked better than any other flux I've used. Be aware that this will cause some surface-level corrosion (green residue on copper pipes) which is only a cosmetic issue on plumbing so it didn't bother me at all. But you might not want to use it on electronics.

I see some stating that you cannot use this on Electronics. Well. I looked up the La-Co 22194 spec sheet from the company. It is NON toxic listed as suitable for BS6920 UK Water fittings. Listed for use with lead free and all soft solders. Do not use with Aluminum Stainless Steel or Silver type soldering. And its Non Acidic.-Non toxic-Non acidic-Water solubleSo long and short. Copper is copper. This works great for electronics. Tested on a SATA PCIe card and boy it helps on the small SMD's and yes it is WITH leaded solder.Once done. Clean with alcohol to remove flux mess. (I would not leave it on the part I am working on)This stuff works. You get a lot. And you save money.You can look this up on Markel homepage. It is made in the USA part number 22194 and at the time I bought it I gave $4.64 for a plastic jar the size of Vienna sausage can.Edit: To the person that said its conductive. Yes it is conductive. But....most all flux IS conductive. Proper clean up on some types is essential.