I'm sure people are getting sick of all my questions - but I desperately need advice! Whats a good liquid plastic/resin for casting a bust??? Preferably hollow.... alumilite and smooth-on seem to have plenty to choose from, but the descriptions on most are vague at best. Can someone with experience in this please recommend something? If it matters, I used smooth-on's BrushOn 40 for the mold... I'm not looking for anything top of the line - just something that is made for what I'll be using it for. Thanks!