I'm basically 99% certain it is stronger than eyelash glue.
At the very least, we used some on my brother, and then I couldn't find the spirit gum remover for a little while and we couldn't get it off any other way that we tried.
I think a large enough amount of it should work for a beard, even a big fluffy beard. Doesn't hurt to get some and test it out to see if it works well at any rate.
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