@gordo, I cut my teeth in the aviation industry for the last ~35yrs, so you can then understand, maybe a little bit better, my use of Celcos… In the aircraft industry, they are all but gone today, with new automated techniques, or completely replaced by composite, but there are few of us dinosaurs left that really understand how to use them to wrap a metal shape around a variable curved surface in a precision way,. It seems to be the home build / experimental part of the industry that keeps this tech alive. 
Glad to see you recognized and appreciated that old-school tech.
-Kenneth