usp cottonseed oil, 2 ml for every 10, then bake the whole thing at 160 for 60 minutes. make sure to let the oven reach 160 BEFORE starting the hour. there's a thread on this started by massive g, but the above worked well for me. i also used the baking without the extra oil and it worked but not as well.
usp cottonseed oil is available online for about 10-15 dollars for 100 ml.