LATICRETE 3642 Latex Concentrate is a concentrated latex admix which is diluted with water on site and then mixed with LATICRETE Thick Bed Mortar or Portland cement and sand to make cement plasters, renders, coatings, mortar beds and screeds for concrete repairs. Portland cement mortars which have been fortified with LATICRETE 3642 Latex Concentrate have greatly improved physical characteristics and can be used in exterior, interior, as well as underwater plasters, screeds and renders.