Nothing lol.
Because even if the glue gets cold when you put it back together, it still bond like crazy, so by the time to push the 2 parts back together, you are going to be able to pull them apart without heating it again.
And FYI, after I took them apart, I tried to cut out as much glue as I can lol, coz it just gets too messy with the glue everywhere.
After many high pressure rinse and many days of rain, not one drop of water in the lights