I've never used it on a model for casting, but have used it on
models in wax for RTV molds and it held fine. I would do a small
test first so that you have an idea of it's limits. I've also
used it to help setup solder jobs instead of wax. It has burned
Since I had some carving wax, green wax wire, and superglue at
hand I glued together a piece. One thing I noticed was that the
glue didn't flow as smoothly I might like for a clean, highly
polished look in metal without a bit of special attention after
casting. I used DURO brand glue, another brand may flow better.
Just look closely to make sure you will get an acceptable look.
If you decide against the superglue you might try tacking the
wire down with some pin tip welds and laquering the model. That,
I've never tried.
Are you attaching the wire on end or laying it down? If it's
being attached on it's end, glue it into a hole. Good luck:)