Does the glue gun need to make direct contact with the glass to heat it up first, or can you just melt the glue from above, letting it drip down on the glass, and then just press the probe immediately into the glue? I really like this suggestion. Thanks.
yes you can just pull the trigger and let it drip onto the glass. I would just put the glue gun right on the glass and put one big blob in one spot so you don't make a huge mess. Once you have your blob, stick the probe right in there.