836LFNC-P Lead-Free, No-Clean Flux Pen

I was having fits with lead free solder until I tried this is is very effective at wetting the surfaces and a little bit goes a long way. I found that if you add flux to the joint before you solder you can just get a small blob of solder on the iron and it will solder itself the minute it comes into contact. If it is a large through hole joint, it will tack it nicely allowing you to easily add more solder. If it is a small joint (30AWG wire for protoboards) it will fully solder the joint in seconds. I usually remove the flux with IPA, but not sure if that is necessary based on some of the other reviews. I have not tried it with solder wick, but based on how it wicks to large copper pads I expect it would work well for solder wick also. I do agree with the other reviewers about the tip being too large. Luckily I deal with mostly through hole and don't have tight spaces to get into. If you have been soldering without a flux pen dont hesitate to get this, you will wonder how you got along without it.

I was surprised at the quality of this flux pen! A quick brush of the wire/base to be soldered, and boom - easy joint! No mess/spilling/waste/brush of a liquid dispenser, no goop of a paste. I solder infrequently (this one pen will probably last me a year), but this will be the only way I get my flux in the future. It is slightly more expensive to use the pen applicator, but it is my opinion that the ease of use and the results more than justify the extra expense.If you solder a lot, you may wish to go another route...but I would recommend giving the pen a try. I love it and won't be going back!!!Note: When first starting, you have to push in the tip a little bit to get the flux to flow...after that, you are in business and it is smooth sailing!

I use this for my electronic products for through-hole and SMD components. this works great. Great price and for 1 liter. This will last me for years...

The flux works perfectly and I've used it on a few circuit boards already. This is my first time trying the "Pen" style flux applicator, and I have to say I absolutely hate the pen dispenser, which is why I gave it a 4 out of 5 stars.The pen applicator tip that I received is different from the one pictured. The picture looks like a tapered cylinder which comes to a relatively small flat tip. What I received was a giant "chisel" shaped tip (think large Sharpie), far too enormous to be squeezing in between tiny components on a PCB.Also, please keep in mind that this flux is alcohol-based, and is therefore both FLAMMABLE and potentially EXPLOSIVE. Nothing to worry about when used correctly, but don't try using it with your butane soldering iron! Also, my Weller soldering station's instructions say that alcohol flux is corrosive to soldering iron tips and will cause pitting. I still use it but just be sure to clean your tips thoroughly afterwards, and always tin your iron with fresh solder prior to storing it away.

I used this on a recent project and was surprised that it didn't come rushing out and run all over the place. A small dab is all it took for most of parts I was assembling. It becomes tacky quickly, so it helps hold the piece in place while you set the height of the component for through hole, for surface mounts it worked equally as well, tackiness was achieved in only a few minutes. You can always tell a good soldering job when you see it wicked through the lead onto the other side, which was the case every time when I used this flux. This pen should last a person a very reasonable amount of time. Clean up was a breeze, some rubbing alcohol an cotton swab was all I needed. If your on the fence about buying this, don't be, its money well spent.

Super easy to use as it requires no clean up of use. It is like using a marker!

This is the first flux pen I have used and I was doubtful mainly because of the reviews I read. That being said this is a great product once you get the hand of priming the tip.. It's a bit hard to get the tip loosened up to get the flux flowing but with some gentle pressure using a towel and hand pressure on the felt tip slowly work the tip back into the body and it will start flowing. After that you are good to go. I use it on all my soldering now and it has made a world of difference in the quality of my solder joints especially the fine electronic parts I use for building mini-quads.

Label and MSDS all indicate this is ethanol mixed with isopropanol that would fully evaporate before the copper and solder reach the bonding temperature. Based on an evaporation test on clean glass (see photos) there is a tiny amount of residue. I assume that is their off-label flux added in homeopathy-style amounts. $17 for a few milligrams of actual flux is a steep price. I wish the vendor were transparent as to what the concentration of the active component should be. Have yet to test during soldering.