Would you like a receipt? <a href=" https://www.gtxgaming.co.uk/blog/montelukast-price-costco.pdf#reflect ">montelukast sodium generic inactive ingredients</a> So you need a mortar that is more porous than the stone itself. Any mortar containing cement will be brittle and impermeable to moisture (characteristics that apply equally to hydraulic lime, which is a natural form of cement).