SIKATOP 121 PLUS REPAIR MORTAR Thin-Patch Mortar/Binder SikaTop 121 is a general purpose repair mortar. May be used for all concrete, inside and out, above and below grade - parking structures, industrial plants, walkways dges, dams, etc. Can be used vertically, horizontal and overhead. Works as a leveling/pore sealing mortar prior to protective coatings. Application thickness minimum 1/12", maximum 1/6".