Like ARDEX K 520, launched earlier this year, ARDEX K 521 is a self-leveling topping used for fast track resurfacing, smoothing or leveling of various indoor concrete and certain non-porous surfaces.
The second type of microtopping — sometimes called a semi self-leveler — is a cross between the traditional trowel- or squeegee-applied version and a self-leveling overlay. These products have ...