STIRRIV2-TF no-clean MT soldering tacky paste flux (ROL0) - 10g syringe kit – for hand-soldering electronics - mid-range tacky paste flux with pine scent for Hot Air SMD assemblies

This flux performs impressively well when reworking boards with leaded solder. I'm very excited to try the manufacturer's newer V5 flux when it's available.

Only flux I use now

We are circuit board rework business and lots of flux being used. We were using different types of flux including some made domestic US and not so satisfy with the outcome. The first use impressed how it flows and did not burn out with high temperature. Easy to clean with IPA 99.99% without the flux cleaner like others.Since the products are marketed by the manufacturer, don't have to worry about counterfeit.

While not cheep, this flux makes soldering surface mount components much easier. The flux cleans the surfaces and conducts heat to the joint to make a reliable connection. The residue left behind by no-clean flux is non-corrosive and doesn't negatively impact the performance or longevity of electronic components.

I'm very much a novice so I can't really speak from a technical level, but this flux really made the job of soldering and desoldering tiny circuit board connections a breeze. I had always had anxiety with soldering small components and close together connections, but after doing some research I realized that flux was most likely the answer to making these jobs easier and it certainly was. It made tinning pads so much easier as the solder just drew itself to the copper pads. And when it came time to solder some tiny resistors in place it was effortless as I barely had to touch the part before the solder flowed and formed a solid connection. Then came the job of soldering in a USB-C port which seemed really daunting with how close the pins were. But after tinning the pads and tacking in a pin it became pretty effortless to flow the solder across the pins. I did have some bridges, so I just cleaned off my soldering iron and added some more flux and easily wicked away the excess solder clearing the bridged connection. Desoldering had also been something I wasn't too great at, but now that I was using flux the solder was just flowing into the solder wick. It also cleaned up really easily with some 91% iso on a cotton swab. And the syringe tip really made this easy to accurately apply where I needed it.Great stuff and really helped build up my confidence with doing such intricate circuit board work. If you've struggled with soldering in the past give this stuff a shot.

I really enjoy using tacky solder flux especially when working with small pitch components. Flux not only helps clean the oxides and other contaminants from components to be soldered but also increase the surface tension of the solder which helps prevent bridged joints and solder from getting where you don't want it.This solder flux flows well and seems to work equally well both with leaded 60/40 solders as well as the 99% lead free variants. The different nozzle types allow you to get the solder where you need it but you might need to use your hot air station to warm the paste as you apply it to get it to flow out of the smaller needles. The inclusion of the needles are great because although I might have some from previous tubes, they end up getting worse for wear or lost so having replacements is a nice touch.Overall, this does the job for a fair price and on top of this, its made in the USA.

I was glad to find a high quality flux paste, and it's made in the USA.All the relevant info is on the side of the syringe, which includes a good selection of 3 applicator needles. I also really appreciate the laminated data card which can be useful when soldering some alloys. Nice touch.The paste has a smooth consistency and resistance to separating like some of the cheaper stuff.A tip for getting the paste thru the smaller diameter needles is to pre-heat the the paste in the syringe, and the needles. e.g. A heating pad can warm up the paste in the syringe, and the needles can be heated with the soldering tip in close proximity, etc. If you have an SMD air-station, that can be helpful as well.Made in the USA, good flow and performance, and easier to clean than rosin. Excellent product!

I have been using another brand of paste flux and was expecting similar results, but this flux produced noticeably better results. The solder flow was outstanding and the resultant cooled joint was very shiny, actually much shinier than with the other paste. Also the residue after cooling is more like a clear viscous liquid and cleans up very easily with alcohol, where the other paste flux residue requires a little scrubbing because it is much gummier.You will definitely want to clean this flux residue from the boards if only because it is quite liquid and sticky.Because I have had trouble with the other brand of paste flux oozing out the syringe nozzle on its own, I started with a smaller diameter nozzle with this flux, but that was a mistake because it takes a lot of pressure to force it through the smaller tip. This is probably due to the higher viscosity as advertised.I'm impressed so far and would recommend that you try this.