Bostik 50 lb. Gray PM Multi-Purpose Polymer-Modified Thin Set Mortar, $20.99 USD/Box, LL Flooring (Lumber Liquidators)

Gray Bostik PM Thin Set Mortar, weighing 50 lbs, is suitable for setting various tiles like ceramic, porcelain, and more indoors or outdoors. It adheres to well-prepared concrete, plywood (interior/dry use), backer boards, and established tiles. Key benefits include suitability for diverse surfaces, quick setting time, low absorption, and easy clean-up.