I can certainly see someone asking if the guard is soldered or not, then I guess you can either tell them "No" or "No, I use JB Weld and here's why..." I did recently see on here, IIRC, a maker who posted a knife for sale and someone replied something like, "Beautiful knife! If it's soldered, I'll take it."
I think JB weld is a great/better option, I was just curios if anyone has had bad reactions form buyers or not. Judging from the replies here it looks like it's not very often.
Thanks for all the comments!