Ulano Hardener D is a liquid stencil hardener that can be used with all Ulano water resistant stencils (including 925WR, TZ, LX-630, LX-660 AND QTX®.), but was formulated for use with Ulano QT discharge direct emulsion. Ulano Hardener D improves the durability and water resistance by creating an additional chemical bond with the mesh. For industrial use only. You should not expect to reclaim your mesh after applying a hardener. Ulano Hardener D penetrates the stencil and forms an additional chemical bond with the mesh that stencil removers cannot break. Ulano Hardener D can be used with other textile emulsions, but will make stencil removal more difficult and may embrittle the stencil.