Once you have the pieces of glass taped, burnished and placed, (making sure all pieces are tight), Tack it together.
The first step in this process is to brush flux onto the entire copper surface. Try not to get too much on the glass. You will want to do this in a well ventilated area because it doesn’t smell wonderful and you really shouldn’t be breathing in the vapor that comes of the flux once it is heated. You can opt to wear a mask if you don’t find it too cumbersome.
Fluxing the copper. Tacking the pieces together.
Now that all of the pieces have been secure by the tacking process, you may start the soldering. Clean your soldering iron very often during this process. To clean the soldering iron wipe it on a damp sponge.
Hold the solder next to the copper and start melting it over the copper smoothly so when the line is finished it has a slightly rounded look. Solder one side then turn it over and solder the other side.
Solder first side. Flip it and solder back side.
Stay tuned for the final steps.