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Methyl Ethyl Ketone Peroxide is an organic peroxide needed to initiate the cure of polyester resins and gelcoats.
See below for corresponding resin quantities to go with each size of catalyst:

Catalyst Size Resin Size
15ml 1 Liter
60ml 4 Liter
250ml up to 5 Gallon
500ml 2 x 5 Gallon
1 Liter 4 x 5 Gallon
3.63kg 1 Drum

The table below contains the catalyst chart when using MEKP to catalyze Polyester Resins & Gelcoats. The MEKP Catalyst must be used or the resin or gelcoat will not cure.


Catalyst Volume 25°C 20°C 15°C 10°C
10 ml per litre or 10 drops per oz. 30 min. 2 hr. 4 hr. ---
15 ml per litre or 15 drops per oz. --- 30 min. 2 hr. 4 hr.
20 ml per litre or 20 drops per oz. --- --- 40 min. 2 hr. 

NOTE: Working time is approximately 25% of above cure times. Avoid working in extreme temperature or direct sunlight.

WARNING: MEKP Catalyst is a hazardous substance. Use with extreme caution. Contact with eyes may cause blindness. In case of contact, flush with water, consult physician immediately. Vapour is harmful, use adequate ventilation during application.