wrote:

90 degrees above ambient?

200 max?
That is the minimum required
Can often be a lot hotter than that. Only isophthalic resin rated for
210F and Vynylester rated at 241F would even be close. None of the
common epoxies are rated for that temperature. You would need a
novolac based epoxy (special high temperature epoxy resin)

Thin some JBWeld. Squish it into the glass between sheets of cellophane
with a large socket or piece of pipe.