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My students do this every year - be sure to reinforce the original on
the outside because of the rough handling that will happen as you
reverse cast. Then coat the inside heavily with Vaseline , especially
the edges where you will have to get a grip to separate the two. After
that start again with the strips - doing the inside of the mask and
smoothing carefully down into the details - using smaller strips there.
After it dries, separate the two at one edge with you fingers and give a
might tug. You can use the original over and over until the edges break
down. hope this helps - using strips n the inside doesn't give as much
detail but works best with kids - pouring plaster gives more detail but
since you can't control the thickness, sometimes they are too heavy and
won't come apart.
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