I purchased it because it is a non-cleaning type. It is comfortable and easy to clean. If you warm up the base material well on a thin stainless steel plate, solder will ride on the base material so if you attach a little lead wire, it is OK without flux for stain. I had to do flux without doing well if I had to pay the sheet metal. Used soldering iron is white light FX-600 or junior 100 W
As a hobby I am making a balance for throwing with a stainless steel spring wire. I purchased this product because it can also be used for stainless steel, but I did not attach it at all. It may be due to my immaturity, but it is safe to use flux as usual.