jetpack,

Got a couple of pics for you showing a plug made from the water putty. The part is the detailed ABS supercharger covers that go on a KMP P-38.

In the first pic, you will notice the small holes drilled in the corners of the recesses...this is so that the vacuum machine can pull the heated ABS sheet down tight in the corners. You can also see that bondo has been used to smooth any imperfections in the hardened water putty plug. In the second pic, the top part is the actual ABS part that is formed over the water putty plug shown at the bottom.