RectorSeal Nokorode 14020 Paste Flux, Cleans and Fluxes, Plumbing, 8 oz.

Great quality, easy use with applicator, works great, good value for the money.

Works well for copper pipe soldering. Easily soldered 1/2, 3/4 and 1in pipes. Solder runs well and does not quickly evaporate in heat. Also easy to clean afterwards.

Took a chance because I’m sick of liquid flux and this paste is so so much better. I don’t think it’s the “standard” paste flux used for stained glass but it absolutely works. There’s no popping, it distributes solder like butter. Cleans easily and with the size of this tub it’s going to last forever. Tested it out on some glass globs and I can’t believe the difference. Solder looks clean and smooth, much less to clean off from the burned liquid flux. 10/10

It cost a little more than I wanted to spend. But honestly, it's been working great so far. Shipping was super fast, too. Definitely worth it for the speed and quality. Glad I bought it.

Good sized can for the money, and bought it specifically because it's the only can that comes with the brush built into the lid which is way better than random brushes bouncing around

It's worked like it's designed to be

I'm completely new to soldering so when I got a soldering iron for Christmas, I immediately got to work trying to solder some displaced wires in an old pencil sharpener. After many fruitless attempts and all my solder sliding off the metal contacts onto my work surface, I finally did some research and found out that I needed some flux. The included brush made application very easy. I just slathered this stuff all over the contact areas and tried soldering again. This time, my solder actually stuck to the wires and metal contacts. It seems like it did the job cleaning both the wires and metal contacts inside my pencil sharpener. I'm not really sure how else to rate flux but this is the first one I used and it worked, so I'm happy.

I tried the liquid one. No way compared to this paste. I will never go back. My solder flows so smoothly. The liquid flux spattered solder. Because it’s liquid there’s almost no way not to use too much. But this paste stuff is a dream. Works excellent for stained glass art.

Tried this for the first time today, I have been doing stained glass for a quite a few years, always used a water based flux, but not anymore after using this, you use less the solder flows better, easier to store not frightened about knocking it over and spilling it, like water based, wish I had found it sooner.

For the past 40 yrs I have used 'Water soluble Aqua Flux'. Read about this Paste Flux and gave it a try. I find that I do not have to apply so much and the solder flows much better.