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Stained Glass Soldering Tips

Updated: Feb 25, 2021

Are you frustrated with the way your solder turns out? Getting your seams to be uniform and smooth takes practice. Here are some tips to improve your soldering.

First, in order to have seams that are uniform you have to fit the pieces together so there are no large gaps between the pieces. Large gaps will give you a wider, uneven seam. Grind your pieces where they touch to narrow the gap.

We normally use 7/32" copper foil when wrapping the glass. If you have thicker glass, you may need to use 1/4" foil. For every small pieces I often use 3/16" or 13/64" so more of the glass is seen. Pay attention to foiling so it is even on both sides to get more uniform seams.

Sometimes your foil may split, particularly when you are wrapping a small inside curve. Unless you add a "Band-Aid" there will be a gap where the foil splits.

to apply this "band-Aid", cut a 1" piece of copper foil and lay it perpendicular over the gap on the front and back, the trim the foil. Also, at the place where the foil overlaps, you can a utility knife to trim a little off if one side is noticeably wider.

Be sure to use the right iron for soldering stained glass. Electronic irons are not powerful enough and can make the job frustrating. Hakko's newest iron, the FX-601 is our studio favorite. Keep your soldering iron clean by wiping it on a wet sponge. Occasionally clean your tip. Hakko recommends their "Solder Tip Cleaning Wire Sponge" for their ceramic iron; for other irons you may use a sal-ammoniac block.

Use a good 60/40 or 50/50 stained glass solder. Children, teen, and nursing mothers should use lead free solder. Apply your flux. Begin by tack soldering your pieces together, then tin (apply a thin layer of solder) your seams. Getting this right take practice. Do not get discouraged. Seams should be as high as the are wide. Start where you have a long seam. Place your tip at a joint, begin to add a little solder as you go. Solder tends to "puddle" up at the joints where the glass comes together, so as your near the next joint stop adding solder and use what's on the tip. You can go back over the seams, but do not let your piece get too hot. Not enough solder will leave ridges and too much solder will bulge over on to your glass.


We carry a full line of stained glass supplies and will be happy to make recommendations on improving your soldering techniques. For 1:1 time we recommend contacting us to schedule some open studio hours or check out any of our upcoming classes such as the Intermediate Class.

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