mold release for plaster bandage belly cast

Hi, I am doing a belly cast for a friend, and I used the plaster bandage to make a fairly thin copy of her belly.

I would like to lay fiberglass or something tough into the plaster bandage negative in order to get out a positive.

I tried this once before, and the fiberglass stuck so well that when I tried to pop the positive out, the mold was destroyed and it took forever to clean the positive up.

I don't even mind losing the mold, but I do mind the amount of work required to get off all the bits of plaster bandage that sticks to the positive.

What can I use as a mold release on the plaster bandage?

Thanks for the help,


Katou

I am not sure how the fiber glass will react to vasaline (or something along the lines - some oily substance) that might work. Because the plaster is porous it absorbs liquids from fiber glass (or what ever else you decide to cast in) and kind of fuses with the cast... so you need to do a trial and error to see how you can avoid this. maybe even a thin layer of lacker on the inside of the mold would work.... make a small mold and experiment. If you understand the principal you can work something out.
Let us know what happened

Okay, could I cast plaster into the mold? What would I use as a release then?

Just to clarify, I am proposing casting plaster such as Hydrocal into a plaster bandage mold.

I have used vaseline before for various things, but often the vaseline is thick enough that it changes the object to be cast.


Katou

You can buy special release agents.
here is one idea for a release agent. I did a search for release agents for plaster molds and this is only one of the answers. I would try the crystal clear acrylic paint - it seem that it would be a cheap and easy solution if it worked!
Let me know what happened...