I get asked all the time how do I get my solder smooth... here are 2 tips that has helped me and I am going to share it with you. Gel Flux, the only way to go. You can control gel flux much more easily than with a liquid or spray, also, have a soldering iron that has a temp control, don't buy the cheap ones at the craft stores, the temperature changes to much and it will cause "sticking" or bumps in solder. Inland is a good professional brand and may cost more but you will get better results.
Or (the sales person in me) I can make some for you... tee hee. I love creating keepsakes for folks that just want a little something special and soldered glass pendants just seem to be the perfect art form for this. If you would like me to create some or would like to purchase one I already have completed, find me here.... Beady Monkey Pendants