Thanks for the suggestion.
Is this the one?
https://www.amazon.com/dp/B0006O1IC...t=&hvlocphy=9007920&hvtargid=pla-320192516391
Yes that is the one , depending on the job its mixed with equal parts i use a toothpick .
For something such as that magnet total needed and plenty would be no more than the size of a grain of rice mixed (turns gray) and making sure surfaces to be bonded are clean.
Like it to fix small parts with it on model trains like cowcatchers cracked castings etc and usually mix it on a sticky note with a toothpick .