ZE-4400 Epoxy Crackfiller – 3 Litre KitZE 4400 is a two component epoxy crackfiller engineered for repairing surface imperfections prior to applying epoxy or polyaspartic coatings. With its smooth consistency and superior bond strength, its ideal for filling hairline cracks, small voids, and surface defects in concrete. Available in two curing speeds, this product helps prep your substrate for a flawless coating finish. Choose your drying time: Normal (8 hour cure) Fast Cure (24 hour cure)