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Cheese cloth with plaster is a good material to reinforce a plastic mask. It is found in hobby model making for creating hills in scenery. The cloth is moistened and can then be shaped onto any surface. Some glue can be add to make it stick to the plastic. Casting resin has a lot of chemical solvent and tends to fill in a cavity and not take on a special shape (unless it is in a mold). Several coats of clear acrylic spray can provide added strength. Make sure to let each layer dry between coatings to get the best result.
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