if you are not happy with solder then you could always try conductive epoxy! Drying time might be the only issue :)
For me, silver solder is fine and it seals against oxidization, just ensure that the pieces being soldered have a good connection and try not to use too much solder. Also, using a good flux paste ensures good eutectic flow :)
For me, silver solder is fine and it seals against oxidization, just ensure that the pieces being soldered have a good connection and try not to use too much solder. Also, using a good flux paste ensures good eutectic flow :)