Step 10: After Sitting For 24 to 48 hours, Demold Your Heart.
Twenty four hours is generally enough, but it doesn't hurt to allow longer. Allow to sit in the shade, and cover with damp burlap or other cloth mate...
Step 9: Mix Concrete and Pour Into Mold
OK, the caulk and letters have dried sufficiently after 24 hours or so, so we can go ahead and mix and pour our concrete. Several admixes of different colors are available, so these can be added at the time of mixing to color the concrete. One of my examples is plain concrete, and the other is a terra cotta color.