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To add to the above great tips, I would note that the type of bubbles you are getting makes it look like you waited too long to pull the pins. The goop has skinned over in most places, then when you drop the panel down it burps out every once in a while. By pulling the pins earlier, it creates a fairly smooth fillet, which shrinks down to almost nothing when it dries.
Often just before I pull the pins, I run another really quick line of #4 along the outside. That re-softens the edge, and since it is on the area to be trimmed off, it doesn't make a mess.
I still use standard sewing pins, but I intend to get some small piano wire some day.
Zeph
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