Review on Delcast Rosin Soldering Flux Paste by Cody Hunt

Soldering Flux Rosin 50G came quickly from CMT and the paste was very thick. Came in an opaque white box instead of the translucent packaging shown in the photo. The color of the flux is darker than the photo, but this may be due to a different opaque container and photo lighting. One reviewer argued that this is not real rosin and I disagree, but they may have updated the product. The seller contacted me after I received the item and expressed a genuine interest in my satisfaction. Given such ambitious behavior, I wouldn't be surprised if they were attentive to feedback. Before I knew better, I used water-based flux on a few electronic projects. DO NOT DO THAT! Unless you're in dire straits and can guarantee you'll come back to redo the job, but it's still a bad idea. The wrong flux needs thorough cleaning and the possibility of missing one or forgetting where it was used is not worth the risk. The cost of change is triple and doesn't include the mental anguish of questioning integrity. Do it right and get the right stuff. For many years I have relied on a flux built into resin-cored solder, but as my skills have improved and the work area has expanded, the need has outweighed. Extra solder is a godsend for terminal connections, rework, component rebuilds and solder retention when using one iron for multiple connections. Among other things, the flux allows heat to flow and the solder follows. Heat flux is especially useful when soldering small terminals with an iron instead of a flame. Without flux (dry) the iron has to stay in contact much longer; heat transfer is slower than dissipation; You end up melting the wire insulation and spending ages soldering connections. When repairing and recycling, faster and more direct heat transfer in and out helps without burning the part you're pulling and surrounding parts; It's also good for initial jobs, but resin core solder usually does the job. However, for jobs that require the iron to remain on between multiple connections, the solder will remain on the tip between jobs and the flux will eventually burn out. Later, when you're ready to iron again, instead of cleaning the tip and re-soldering, you can apply some rosin flux directly to the joint and just use the solder that's already on the tip. I used this flux immediately on a 1/0 battery terminal tip and time will tell how well it holds up but I'm sure it will protect it well. If anything changes I will update this review.