You got a newbie here. Inspired by some Scott Hardy flasks that I have seen, I thought I would start out by purchasing a flask and then adding some embellishments. I purchased a cheap round stainless flask and wanted to added a sterling overlay to the front. I sawed out a piece that is about 3" in diameter and used Harris Stay-Clean flux with Harris Stay-Brite solder. I pre-tinned the silver and everything went as I expected. When I tried to solder it to the flask I couldn't get it to stick. I learned a few things from this failure (yes I have to order a new flask and more silver!). I had some Handy Flux nearby, so I tried it, and with too much heat, did get it to stick. This is actually a brazing flux with active temp of 1050-1700 deg. So I think I have a flux problem since it did stick. I was aiming for a low temp solder as I don't know how the flask is made and don't want to cause a leak. I also see that I need to heat the entire piece, as localize heat caused the material to expand with nowhere to go, causing it to distort the material into a convex shape. So a few questions - does anybody have a recommendation for solder and flux that will work with the stainless? This is a $6.00 Chinese made flask, no telling what the material really is, but it doesn't appear to be plated. It's also very thin material. Am I better off looking for an epoxy as a solution? I was wanting to add something to some stainless steel shot glasses as well, so I'll have the same problem there. All your advice is appreciated.