While I'm more acquainted with epoxy resin as an amateur boatbuilder, I know that our telescope (a 1.5 meter aperture Cassegrain made by Brashear-Contraves) has indeed epoxied components. Namely, the primary mirror (a full thickness f/1.5 paraboloid) stays in an isostatic cell, and many supports are actually epoxied to the mirror blank.
Dr. Giuseppe Bianco
Centro di Geodesia Spaziale "G. Colombo"
Agenzia Spaziale Italiana
75100 Matera (MT), Italy
phone:+39-0835-377209
fax: +39-0835-339005
e-mail: giuseppe.bianco@asi.it