How to Make Crown Molding from Plaster of Paris

Step-by-Step Guide

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   Step 1: Roll out a thick piece of clay and press it onto a piece of crown moulding.

   Thickness adds strength which is needed later when pouring the plaster. , The clay should be an exact reverse replica of the crown moulding. , Seal edges to contain the poured plaster. , Ensure that the nooks and crannies are filled before pouring enough plaster to fill the mould.
   
   Your fill line will be the thickness of the crown moulding. ,, Handle the dry plaster moulding carefully to prevent chipping. ,,, It should fit snugly. , Wipe off excess caulking with a slightly damp and smooth cloth. ,
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   Step 2: Peel the clay off and straighten out minor bends.

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   Step 3: Reinforce walls with wood pieces and/or strong plastic.

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   Step 4: Mix plaster of Paris and pour a little in the mould.

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   Step 5: Discard the clay and let the plaster dry until it feels dry to the touch.

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   Step 6: Trim as needed.

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   Step 7: Ignore any tiny air pockets for now.

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   Step 8: Spread a thin layer of glue on all contact points.

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   Step 9: Insert the plaster moulding into the gap without force.

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    Step 10: Once the glue is dry

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    Step 11: fill any air bubbles and gaps with caulking.

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    Step 12: Once you're satisfied that the gaps and surface are seamless

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    Step 13: prime and paint as needed.

Detailed Guide

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