For anyone interested, Dr. George Borun wrote an article for the
Southern California Association of Violin Makers Journal in 1992 that discusses using Silicone Heater Blankets. The information about prices is out of date, but everything else applies today.
Here is the link to that article.
I'm curious if anyone here uses Silicone Blankets with some kind of device for regulating the heat. I still use the "pull the plug" method to control the heat, but I've always wondered how well the regulators work in practice.