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How do I pour airless plaster?

Preventing undercuts

You can pour plaster around an object such as a commercial tile edge piece, or a light switch plate, or numerous found items. Just remember that the item cannot have undercuts. That is, it can't have areas underneath where the plaster can flow under, or you won't be able to pull the item back out. If you have an item with undercuts, use clay to fill the undercuts. Another useful trick is to take several found objects, push them into a slab of clay (imbedding any undercuts into the clay), then pour the plaster.

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