I'd try the silver myself - another source used to be Radio shack -
PCB fix paint - small bottle of silver and clear coat.

Normally heating coils - larger ones anyway - have to be crimp connected
as a solder type connection simply melts.

This one, likely low current and such could be soldered - however in
moisture
it might be the real killer of tin lead. I'd coat with a sealing coat
of
some type.

Martin
--
Martin Eastburn, Barbara Eastburn
@ home at Lion's Lair with our computer
NRA LOH, NRA Life
NRA Second Amendment Task Force Charter Founder