AKPEROX HC75 in combination with a cobalt accelerator (AKCOBALT 10%) cures unsaturated polyester resins at 60˚C and higher temperatures and is suitable for curing systems. AKPEROX HC75 with cobalt accelerators can be used, for example, for artificial marble, polymer concrete, filament winding and air drying paints. The combination of AKPEROX HC75 with cobalt accelerators and possible amine accelerators (e.g. N,N Dimethylaniline) is also suitable for ambient temperature curing of vinyl ester resins. AKPEROX HC75 cures much faster in these resins than the commonly used peroxide AKPEROX LPT.