The catalyst methyl ethyl ketone peroxide is the element that allows the resin and the gelcoat to polymerize and then harden after a certain application from the mold.

It must be added in the right proportions to the gelcoat or resin and appropriately mixed.

Poly3 treats liquid catalysts (such as Polimec 50) for polyester and vinylester resin in packs of 1 kg - 5 kg - 25 kg.