TEC AccuColor EFX Epoxy Special Effects Grout - Part A This three-part epoxy system for interior floors, walls, and countertops is a dual-purpose mortar/grout designed for residential to extra-heavy commercial use. It is recommended as a grout wherever complete stain or chemical resistance is required and desired. Used as a mortar, this system is ideal for installing green marble and other moisture-sensitive stones over various substrates. Features Part A: Two 1⁄2 Gallon (64 fl. oz.) Resin/Pigment High chemical and stain resistance Durable and impact-resistant Interior and exterior use (when used as mortar, it is recommended for interior use only) Available in over 700 colors with optional metallic and glow-in-the-dark effects Freeze/thaw stable. Store in a dry location. Do not store open containers The maximum shelf life for part a is 18 months from the date of manufacture Parts B and C are sold separately Suitable Substrates Cured concrete and mortar beds Brick and Masonry APA Grade Trademarked Exposure 1 Plywood Gypsum wallboard/Water resistant gypsum wallboard Existing ceramic tile and natural stone Cementitious backer units (CBU) or glass mat backer board Vinyl composition tile (VCT)