Electronics Forum | Thu May 25 10:55:21 EDT 2006 | Chunks
Loctite makes a product called MP218 that works well with mixed alloys.
Electronics Forum | Mon Nov 13 07:58:54 EST 2006 | realchunks
It depends on your paste. Use the highest temps your existing paste can go too.
Henkle Loctite makes a solder paste just for this application called MP218. There probably are others but they are available.