How many parts will I get per mold before the mold starts to break down?

This all depends on the intricacy, what material you are pouring, and the detail of the part. Other factors are how many undercuts and how well the mold is cared for. It also depends on how often you are pouring, how hot your mold gets and if they are allowed to cool between pours. The following are estimates done with the use of a mold release using Alumilite resins. High Strength 3 - 50-75, High Strength 2- 40-60, 5 Minute Molding Putty- 35-60, Amazing Mold Putty- 35-60, and Quick-Set- 10-40.