A&C
I hope you never get to fly a glider that has had the primary structure post cured at 59 Degrees C. Most of the resin manufacturers specify 80 degrees C for about four hours following eight hours at 60 degrees C.
The most common resin system for glider repair is Schueffler L285 with H286 hardener.
Their instructions state:"
To conform to their respective airworthiness requirement, gliders and motor-gliders should be post-cured for a minimum of 10 hours at 50-55C,
and powered aircraft for a minimum of 10 hours at 80-85C. This is after initial room temperature cure. Actual good practice for gliders is 15 hours at 56-60C.
I believe the Epikote162 /Laromin resins used a slightly lower recommended post-cure temperature, but this resin is now no longer permitted in EU countries because of its carginocenic properties.