silver solder is really good. It melts and flows at the right temperature and looks very nice after polishing. Acidic flux works very well, but it will be rough on a soldering iron tip. Acidic flux will pull solder through anything if you heat the metal enough. I tried this evening installing a simple wire wrap. First drip the flux, heat the iron and tin the tip, and then press the iron against the part to be soldered. Wear a respirator as the flux will evaporate quickly. Once your part is hot enough, touch the solder where you want it to flow and it will happen almost immediately. This worked great for installing the twisted wire loops on this piece. I just got interested in winding wire and this was my first attempt. The results were so encouraging that I bought the material for a second try and I find silversmithing, diamond cutting and jewelry to be an interesting and potentially lucrative new hobby.