Please give the list of ingredients or recipe link for this paste.
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I'm afraid that this will start to harden quickly.
If you can leave it in the mold with plastic wrap tight to the back, you might be able to hold it for a day, but then you have tied up your mold.
If you are going to place lace onto the side of the cake, just let the pieces dry on the outside of the cake pan. Then they will fit just fine onto your cake. That way you can make a bunch of them at a time.
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