I have an empty liquor bottle that is shaped like a skull. I would like to fill it with Alumilite Amazing Clear Cast and once it dries completely I will break the glass and carefully peel it away from the resin. However, resin bonds extremely well to glass and I need to know if anyone knows a way to prevent Alumilite Amazing Clear Cast from sticking to glass? I'll probably end up purchasing silicone mould making material and make a Silicone mould of the skull but for now I thought I'd see if anyone knows the answer to the above question. Thanks for any suggestions
You would be better off using the silicone instead. Because like you said - it will bond to the glass so if you try to break the glass you will actually be breaking the resin. Or you might not even be able to break the glass at all.
There is pretty much no way to prevent the resin from completely bonding with the glass which would make the removal of just the glass impossible. If you just need the silicone mold to be a little smaller than the liquor bottle then there is a way to "shrink" the mold itself while making a mold of the skull but other than that I would not attempt to pour resin into the skull and expect to be able to remove the glass from the resin.
I would just make the silicone mold of the skull and don't even try the resin.