Oh.
Apologies for leading you astray. The cooking oil continues to work for me - it must be some difference in the qualities of the different silicone we're using for our moulds.
I guess it's good for me to know that if I plan to switch to a cheaper silicone, I need to be prepared to invest in some mould release as well as the ultra sensitive scales.
I'm glad your mould can still be used. (Did you just use a hobby knife to cut it?)
EDIT: I just picked up some more Resin and Silicone. I paid $66 for 1kg of Silicone and $36.30 for 950g of resin. That's all in $AU, but $AU and $US are pretty comparable these days.