Hi Midair,
It sticks well to glass rods. I used it in the fuse and wing rods of the Bearcat and Boeing. Is it better than Elmer Probond? Don't know yet as I haven't midaired those planes yet.

I really like Pica's glues and use Gluit, Acrylic Copolymer (Gluit-2-it), and HD 601 on most of my planes. All three are very easy to sand with no "rubbery" feel to them. They are hard but have such a high solid content that they sand easily.