After I was sure I had maximized the use of the Play-Doh, I decided to pour the molds before the Play-Doh dried out and cracked. I chose a clean, plastic bucket that was flat and smooth on the bottom, for ease and efficient mixing of the silicone. After 3 minutes of mixing, the silicone turned to a uniform light violet color, and was ready for pouring. I used a disposable cup to slowly pour the mixture around the sides of the casts first, taking care not to create any air bubbles. I then filled the molds to just about 1/8 of an inch over the entire cast, and vibrated them to remove any bubbles. I then finished pouring them. (Fig. 4) I used a toothpick to ensure that I would have at least 3/8 of an inch of silicone over the highest point of the casts. I then waited 16 hours for them to set up. (8 hours recommended before handling).

Figure 4. Filling with silicone.

I removed the screws on the bottom of the molds, and peeled off the melamine to expose the bottom part of the mold for a few extra hours of set-up time. It seemed uniformly set-up but I wanted to make sure. After the allotted time had passed, I slowly removed the 1x4s. I then carefully pulled away most of the Play-Doh from the edges. A little had stuck to the silicone, but after I pulled the original casts out I was able to soak them in some water in the sink, and then as it turned to mush, I simply, gently brushed it off.