Yes, part of the process...doing this over and over, different iterations. This uses Hydrocal, a kind of blend of plaster and cement...more durable than plaster. Smooth finish thus far. Fine powder, mix with water. Pour a little thick, but pours, and the tapping to release air bubbles helped move some of the mixture through the box.
Once I pop it out of here (screwed in sides), will see how it works when dry. This time the letters are made to "stay in" the plaque. Back has a sheet of hardware screen (metal small grid mesh) to add strength.
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