Easy to Apply Altius; Concrete Repair Self Leveling is a two-component repair material in a convenient cartridge which fits standard caulking gun applicators. The cartridge nozzle (included) meters and mixes precise proportions of material for optimal leveling, hardening and long-term use. The gray material can be sanded in 15 minutes and is paintable in one hour. Better Science for Better Repairs from Altius Since 2001 when one of our lab assistants invented masking tape, Altius has been applying science to life; developing adhesive products and technologies that help entire industries and individual businesses worldwide. The work that began with a single Altius engineer now spans decades and generations. And all of it goes into each of our adhesives, sealants and protective coatings; Concrete Repair Self Leveling; to improve performance, and to help businesses like yours operate faster, better and more efficiently.