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I'm probably telling people how to suck eggs But!!. I had to teach our mechanical workshop guys how to silver solder. They said silver solder didn't work. They had things clean enough They had plenty of the correct flux they had plenty of heat (oxy Acetylene) But joints didn't run and leaked. I...

Thourouly dry your casting in the oven Apply loctite 290 (used to be called superwick in) apply pressure /vacuum depending on which is easier to drive the 290 into the casting voids. This will last a lifetime unless you get acetone near it

stainless is an extremely poor conductor of heat and electricity which is one of the reasons why it is such a pleasure to weld to prove my point try fusion welding of copper, gas or tig to see what I mean

Any proffessional plastics supplier will get it for you It makes Teflon look very cheap