For holding parts in position for alignment, regular casting
investment or plaster of paris works most excellently. No need to
make things anymore complicated, or buy some spiffy-do new inproved
product at a premium. Tried and true for decades.
As for the art metalclay project(?!!) in the latest Lap Journal,
anyone familiar with my past posts does not have to guess at what I
think about a metal clay covered cheese puff. I thought our parents
taught us not to play with our food.
Richard in Denver