Yes LEDs have very low operating temperatures, It'd hardly heat up even if you leave it overnight as compared to incandescents
In my case. since I'm too heavy for my ceiling to support (gypsum ceiling boards) My only option was to work from below to seal it. I used transparent neutral silicone sealant (leftovers from working on car windshields). A very fine point, a steady hand and lots of patience is needed.
oh and a sturdy ladder would help too
Hope this helps