Cauldron project coming soon...

I've decided to make a cauldron and two witches for 2010's Halloween. The cauldron will feature a motor (to power the stirring system) and a small see through pocket for a black light to light up the whitener I will be filling up the cauldron. The main problem will be making the stirring mechanism water proof. I will be basing my cauldron on "Andrew manor"'s 2004 cauldrin(http://www.bastardrat.com/2004cauldron.html) and I will be basing the stirring mechanism on uhh... this persons "bubbling brew" prop (http://www.fulcrumsites.com/haunt/html/bubbling_brew.html).