"Joshua Halpern" wrote:
...or silicone based resins that you can use (with luck) to 450 C =20
...strictly paint on and the replacements for glyptal=20

The silicone one is the one I remember.

For reasons that REALLY make no sense to me now, I had to
thermally decompose sodium azide (NaN3) under high vacuum...

Even in those days I was a theoretician, but for some reason got
tied up in this weird system (optical pumping Na Zeeman hyperfine
- primitive, but was able to vary a lot of conditions).=20

I may be showing my age, too.

Tomasso.