Too much flux and carrier......not enough solder.
I have four tubes somewhere. A distributor sent them to me to test. I used one - it was worthless - and offered to send back the rest. He said he wasn't going to carry them, so I could keep the others. I never used any of them.
What Stacy said, add that the flux bubbles up carrying solder with it before collapsing down to not fill the space it formerly occupied. I got some for soldering a piece where I was attaching 60 bezels to a flat sheet of silver and had so much cleanup work to do that I considered scrapping the piece and starting over
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