Hi Margaret.
We at PMWest have a reasonably low flowing rose solder (14kRose
Extreme easy) I do not know if it flows much lower than Hoovers
solder.
FYI-You have one thing going against you though-When solder makers
add the flow reducing metals, they reduce the copper in the blend,
which makes for a very pale rose color. If we leave the copper in
there, the temperatures stay too darn high. I spent weeks trying to
untie this metallurgical knot. The above solder is our best effort.
Come see us at Tucson, Booth 2500 in the MJSA pavilion at AGTA. (In
the Arena)
Daniel Ballard
PMWest