Stef,
I didn't know what Gel Wax you were referencing, but I poked around a bit using the key words mineral oil / polymer resin, and Google pointed me here:
http://www.rusticescentuals.com/aboutgels.htmlWhich is a candle making site, discussing gel candles. It says that the gel candles are made with the mix you posted. They say a company called Penreco has the patent on the mix.
So I went to their site. They do make it, but no joy finding if there is heating involved in the mix. (but I only spent a few minutes there)
http://www.penreco.com/index.aspSo I did a patent search and read the full text of the gel wax patent.
http://www.patentstorm.us/patents/6471731-fulltext.htmlHere is a possible relevent quote:
"mixing the wax and the polymeric material to form a candle composition; and forming a candle from the candle composition, wherein the candle is characterized as having a phase transition temperature of about 35° C. or higher;"
*Shrugs* Thats all I got in the time I had to look. No personal experience with it.
Best of luck