In the composite industry, we have 5 types of release agent:
Polyvinyl alcohol (PVA): A clear, blue or red liquid. When it dries it forms a plastic film over the surface of the mould
Wax systems: These can be a paste or liquid. These include carnauba wax and also other natural and synthetic waxes
Semi-permanent polymer systems: These are also called semi-permanent release agents and can also be called polymer release agents. These are based on one or more polymeric resins dissolved in a solvent.
Hybrid systems: These systems combine wax and polymer
Internal release additives: These are incorporated into sheet moulding compounds and dough moulding compounds