It seems to be a fact of life that flux can dry out rather quickly.
Especially when one does not secure the lid at day’s end, as in my
It is a simple matter to ad a little distilled water, which can be
done many times over the life of the flux. Tap water can sometimes
cause problems with solder flow if high in mineral content as ours
is in Southern California. I learned this anecdotally from my
teacher Deb Jemmott and have never forgotten it!