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If you are going to do soldering work, you will definitely need to have flux on hand. I will introduce you to flux! What is soldering? What is flux used for? How to make homemade flux that is cheap and has good performance? I will introduce the results of my research and my personal views! Commercially available flux that appeared in the video HOZAN Flux 30mL 400 yen (as of 5/24/2022) https://amzn.to/3zhXoFM *A classic flux! This is all you need for electrical work! Hakko Sussol F Flux for Stainless Steel 20mL 334 yen (as of 5/24/2022) https://amzn.to/3aRoeLp *You can solder various metals! It is convenient for DIY if you have it on hand. If you make your own flux, you can make a lot of it at a very low price! It will be sticky until it dries, but I think the performance itself is better than commercially available products. I recommend it! Here are the materials: Pine resin 100g 275 yen (as of 2022/5/24) https://amzn.to/3Pzizs7 *Can be used for more than just flux. I think pine resin alone is also very cheap. IPA (isopropyl alcohol) 18L 6600 yen (as of 2022/5/24) https://amzn.to/3ILGimI In addition to this, it can be used for a wide range of purposes such as degreasing, cleaning, dilution, and disinfection. It may be a must-have for DIY! ? There are some that are cheaper and have a smaller capacity, but the cost performance is poor.