When did Lance go to an Aluminum/Azdel construction

After doing some research, it looks like the aluminum frames began in 2005. I went to the Lance Support site and looked at the various years' brochures. The first mention of azdel (by doing a search in the pdf doc) is in the 2012 brochure. Not sure if this means they didn't use azdel until then, but given the way they now advertise its use, if they used it prior to 2012 you think you would see it in their brochure.