In the field of mold making and casting, it is generally assumed that you make one mold of the original and are done with it. The same mold can be used to produce multiple castings as required.
However, experienced mold makers will be quick to point out that there are times when it is prudent to make secondary molds. Such as:
Multiple life casts: Alginate is generally used to capture molds from the live human body as it is skin safe. However, the only drawback is that alginate tends to shrink quickly as the water evaporates. Continue reading The Need for Secondary Molds