Virginia, The solder isn’t bad. I know of several jewelers who have
had a similar problem. To me, it seems that Hoover’s solder flows at
a temperature that is close enough to the melting point of some 18
karat gold alloys that is difficult to work with. This is especially
true if you are trying to solder on castings. The reason? Casters
need an alloy that will flow at a lower temps, allowing them to use
lower flask temps and generally giving them a lower viscosity. And,
some alloys are just lower melting than others. You generally don’t
have as much of a problem with an alloy that is designed for
fabrication because a low viscosity/melting point is not a factor.
For this reason I advise you to find a solder that has a melting
point that is more appropriate for the gold you are using. That may
mean using a hard solder from another company (I have used Stuller’s
hard solder and find it to be pretty consistent) or using medium
Hope this is helpful.