I’m needing some guidance on how to proceed with my pot metal parts. My parts have now been cyanide copper plated and are ready for me to fill the pits. Ultimately, these pot metal parts will be chrome plated. There is some good information in this forum regarding what the next steps are but I find myself needing a few more details. Like, what kind of solder do I use to fill the pits? Do I use tin/lead or go lead free? Do I use a tinning paste or just a flux and solid core wire. I think that acid core is not good but what about rosin core? Should I use a solder iron, propane torch, or butane pencil? Is it necessary to use a stainless steel brush before the soldering? My soldering experience with copper plumbing and with electronics tells me that one solder doesn’t fit all situations.

My gut feel is that I will be best served by finding a solder or flux combination that easily wets the copper and that the lowest melting point is best so as not to get close to the melting point of pot metal.

Thank you for your help!