I used RectorSeal #5 which is food safe soft set sealant. I was able to grind most of it down on one of the other keggles and it does look much better. I was reading that any stainless steel will rust after welding because the heat disturbs the surface tension and will need to be re-passivated with something like Bar Keepers Friend. I was wondering if anyone has experience using that.
don't use pipe dope on your fittings. just sayin'. you could take advice or don't. either way, good luck in your adventures.