As a companion product to QLT(when it is used with added diazo to provide water resistance), we’ve introduced Hardener WR to improve QLT’s durability and water resistance.  It can also be used with most diazo sensitized, diazo-dual cure (water resistant) emulsions, and SBQ textile emulsions to which diazo has been added. Whereas virtually all hardener treatments make stencils permanent, stencils treated with Hardener WR can be removed easily!