Help withMolding a skull

[Ravenson]

Hey guys( and Gals) I hope you can help me with a issue/problems I have been having.  I have been working on learning how to mold skulls now I am getting some nice molds and some good looking final castings, but I am having a problem with the silicone getting in to the brain cavity while I am doing my molding.  does anyone have any ideals on how to stop this from happing I would like to be able to display the original skulls  after I have molded them and the pink silcone being in the brain cast just does not look right lol.  I have tried to use water based clay to fill the brain case before I make the mold on the thought that I would be able to get it out after word but some silcone still got in.  has anyone of you guys ever made molds of skull and had this problem and how did you fix it.

thank you Jeff

[gator dun]

i have'nt molded any skulls yet  but what about maybe stuffing a piece of plastic bag in there to fill the brain,then after wards using pliers or a wire hook to yank the plastic bag out. would you mind posting some pics of your molds and cast skull i'minterested in seeing how they are done,

[Ravenson]

Humm Let me think about that am plastic bag...maybe a balloon filled up to fit in the brain case that might be a good starting place.  As far as pictures I will see what I can do I am going away this weekend so It might not be till next week and I warn you I have not been doing this long so I need to improve a lot lol.  I have mostly done small skulls I have gotten off e-bay or from friends. I will rty and get some pictures up soon.

Jeff