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I've never used white out. I just use powdered yellow ochre. I can
make it as thin or as thick as I want with water. No toxic fumes. I
also use the graphite lead off of a pencil for soldering hinges where
a tight fit is important.
I use a soldering resist maybe once a year if that.
It's really just best to have good torch control.
Have fun and make lots of jewelry.