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Is there any glue that will hold glass together at slumping temperatures? I slump at about 1100F.

what are you trying to do? Are you trying to avoid an extra firing instead of first doing a tack fuse and then slumping?

i doubt it. most glues are organic, and organics can't usually last that high. there may be some hi-temp epoxies; for instance, you can use some epoxies on car headers, which probably reach 800-900F or so.