Possible problems with soft silicone vacuum casting prototypes:
1. Less turnover.
2. Appearance of burning mold.
3. Dry surface, not dry inside.
4. There is not enough tension.
5. The mold is not resistant to acid and alkali and is not resistant to aging.
6. The appearance of the mold surface is not smooth.
All of these problems can be solved by operation.
quick silicone prototype: