FOX SEALPLUS FM502 is a liquid crystallized capillary impermeability additive consisting of various special chemicals, which, thanks to these active chemicals, react with by-products resulting from water and cement hydration in fresh concrete to form an insoluble crystal structure in the pores and capillary cavities of concrete. Thanks to this crystalline structure, the water permeability of the concrete decreases. Fox Sealplus FM502 has the ability to self-heal and repair cracks below 0.4mm that may occur in concrete.