I'm attempting to fret a FB with this gold fretwire from LMI, and I'm having some trouble. After cutting my fret slots with one of Shane's fret slotting blades, a .024" feeler gauge fits snugly in. The edges of the slot are lightly beveled with a 3 corner file. The total width of the tang on this wire, including the barbs, is .032", but, oddly, the frets seem to go in the slots too easily and they won't stay down.
Closely examining the barbs, I see that they are visibly smaller than the barbs on a couple of different StewMac fretwires I have. They feel really tiny, too - my thumbnail barely catches on them if I "scratch" downward from the crown to the bottom of the tang, whereas it catches easily on the StewMac wire barbs. So, that seems like part of the problem. I'm still puzzled, though, by the fact that the frets seem like a too-loose fit in the slot as I'm tapping them in, because the total width of the tang/barbs is the same (within .0005", anyway) as the StewMac wire, which hasn't given me this trouble.
In any case, they just will not stay down. I've got the wire bent (in my fret bender) to a very slightly tighter radius than the radius of the FB, and the frets pop right back up in the middle (just a little, but, obviously, anything less than tight to the board is no good). I can push them down tight with a piece of wood, and they just boing right back up when I release the pressure, like they're just not holding to the walls of the slot. Then, when I pull them back out, they come out too easily, too.
.032" barb width in a .024" slot, and this is happening...??
This is the second FB I've done with this wire, and I had similar problems with the first one (which was ebony, by the way; this one is Madagascar rosewood). That time I solved it with gobs of superglue and holding the frets in while the glue cured. I had bent the fretwire to a tighter radius that time, and I thought that was my main problem. This wire is definitely stiffer than normal wire. This time, as I said, I bent the wire so it's just slightly tighter than the FB radius, and still no go.

What gives?