crockpot and candle wax?

[mujercaliente.livejournal.com]

Tomorrow I plan to try to make some candles.
I read the memories/faq about how you need to watch wax very carefully, but I'm wondering if that applies if you put the wax in a crock pot/slow cooker?
I remember my mom used to leave food in that thing all day when she was at work, but does it still render wax very unpredictable?
Thanks for any advice you have!
Lauren