The service life of silicone moulds is heavily dependent on the casting resin used. Slow hardening casting resins attack the mold surface more strongly. By using silicone systems with oil-curing crosslinkers or by using silicone spray before each casting, the service life can be extended. For molds with a hardened surface, the mould may be slightly regenerated by storage in silicone oil at 40°C – 80°C for 4 – 8 hours.